Description

Introduction： 2PC Air Suspension Compressor Valve Block For Jeep Grand Cherokee WK2 2011-2021 Introduction： Two front Air Suspesnion shock absorbers are connected from the front suspension to the chassis, and two rear Air Suspension shock absorbers are attached between the rear suspension and the chassis. Shock absorbers have three main purposes: 1. They control spring action and oscillations to provide the desired ride quality. 2. They help prevent body sway and lean while cornering. 3. They reduce the tendency of a tire tread to lift off the road, which improves tire life, traction, and directional stability. Because Air suspension shock absorbers control spring action, spring oscillations, and chassis oscillations, they contribute to vehicle safety and passenger comfort. If the shock absorbers are worn out, excessive chassis oscillations may occur, particularly on rough road surfaces. Th ese excessive chassis oscillations may result in loss of steering control. Worn-out shock absorbers also cause excessive body lean and sway while cornering, which may cause the driver to lose control of the vehicle. Shock absorbers are extremely important to providing longer tire life and improving vehicle handling, steering quality, and ride quality. Air suspension Shock absorber design is matched to the defl ection rate of the coil spring to control the spring action. Several diff erent types of shock absorbers are available for special service requirements. Fitting the Following vehicle: Jeep Grand Cherokee Jeep Grand Cherokee 75th 3.6L 2016 Jeep Grand Cherokee Altitude 3.6L 2018-2020 Jeep Grand Cherokee Blindada 5.7L 2017-2019 Jeep Grand Cherokee High 3.0L 2018-2020 Jeep Grand Cherokee High 3.6L 2018-2020 Jeep Grand Cherokee High 5.7L 2018-2020 Jeep Grand Cherokee Laredo 3.6L 2011-2020 Jeep Grand Cherokee Laredo 5.7L 2011-2013 Jeep Grand Cherokee Limited 3.0L 2014-2019 Jeep Grand Cherokee Limited 3.6L 2011-2020 Jeep Grand Cherokee Limited 5.7L 2011-2020 Jeep Grand Cherokee Overland 3.0L 2014-2019 Jeep Grand Cherokee Overland 3.6L 2011-2020 Jeep Grand Cherokee Overland 5.7L 2011-2020 Jeep Grand Cherokee SRT 6.4L 2013-2020 Jeep Grand Cherokee SRT8 6.4L 2012-2015 Jeep Grand Cherokee Summit 3.0L 2014-2019 Jeep Grand Cherokee Summit 3.6L 2014-2020 Jeep Grand Cherokee Summit 5.7L 2014-2020 Jeep Grand Cherokee Trackhawk 6.2L 2018-2020 Jeep Grand Cherokee Trailhawk 3.0L 2017-2019 Jeep Grand Cherokee Trailhawk 3.6L 2017-2020 Jeep Grand Cherokee Trailhawk 5.7L 2017-2020 Jeep Grand Cherokee Upland 3.6L 2019-2020 Ram 1500 Ram 1500 Big 3.0L 2014-2018 Ram 1500 Big 3.6L 2014-2018 Ram 1500 Big 5.7L 2013-2018 Ram 1500 Classic Big 3.6L 2019 Ram 1500 Classic Big 5.7L 2019 Ram 1500 Classic Express 3.6L 2019 Ram 1500 Classic Express 5.7L 2019 Ram 1500 Classic Laramie 3.0L 2019 Ram 1500 Classic Lone 3.6L 2019 Ram 1500 Classic Lone 5.7L 2019 Ram 1500 Classic SLT 3.0L 2019 Ram 1500 Classic SLT 3.6L 2019 Ram 1500 Classic SLT 5.7L 2019 Ram 1500 Classic ST 3.0L 2019 Ram 1500 Classic ST 3.6L 2019 Ram 1500 Classic ST 5.7L 2019 Ram 1500 Classic SXT 3.6L 2019 Ram 1500 Classic Special 5.7L 2019 Ram 1500 Classic Tradesman 3.0L 2019 Ram 1500 Classic Tradesman 3.6L 2019 Ram 1500 Classic Tradesman 5.7L 2019 Ram 1500 Classic Warlock 3.6L 2019 Ram 1500 Classic Warlock 5.7L 2019 Ram 1500 Express 3.6L 2014-2018 Ram 1500 Express 5.7L 2013-2018 Ram 1500 HFE 3.0L 2016-2017 Ram 1500 HFE 3.6L 2013-2016 Ram 1500 Laramie 3.0L 2014-2018 Ram 1500 Laramie 3.6L 2014-2018 Ram 1500 Laramie 5.7L 2013-2018 Ram 1500 Limited 3.0L 2015-2018 Ram 1500 Limited 5.7L 2015-2018 Ram 1500 Lone 3.0L 2014-2018 Ram 1500 Lone 3.6L 2014-2018 Ram 1500 Lone 5.7L 2014-2018 Ram 1500 Outdoorsman 3.0L 2014-2018 Ram 1500 Outdoorsman 3.6L 2013-2018 Ram 1500 Outdoorsman 5.7L 2013-2018 Ram 1500 R/T 5.7L 2013 Ram 1500 Rebel 3.6L 2015-2018 Ram 1500 Rebel 5.7L 2015-2018 Ram 1500 SLT 3.0L 2014-2018 Ram 1500 SLT 3.6L 2013-2018 Ram 1500 SLT 5.7L 2013-2018 Ram 1500 ST 3.0L 2015-2018 Ram 1500 ST 3.6L 2013-2018 Ram 1500 ST 5.7L 2013-2018 Ram 1500 SXT 3.0L 2015 Ram 1500 SXT 3.6L 2013-2018 Ram 1500 SXT 5.7L 2013-2018 Ram 1500 Special 5.7L 2014-2018 Ram 1500 Sport 3.6L 2017-2018 Ram 1500 Sport 5.7L 2013-2018 Ram 1500 Tradesman 3.0L 2014-2018 Ram 1500 Tradesman 3.6L 2013-2018 Ram 1500 Tradesman 5.7L 2013-2018 Evolution Related ： Jeep Grand Cherokee ZJ First generation (1993-1998) WJ Second generation (1999-2004) WK Third generation (2005-2010) WK2 Fourth generation (2011-present) Ram 1500 D/W First generation(1981-1993) BR Second generation(1994-2001) DR Third generation(2002-2008) DS Fourth generation（2009-2018） Fifth generation（2019-present） Platform Drive Layout: Front Engine-Four Wheel Drive Layout Advantage of Our Air Suspension: -The Original Size -Direct Replacement -Perfect Fit -Safe and Stable -Longer Life -Eliminating abnormal sound -After-sales Guarantee -Made of high quality raw materials, effectively reduce air leakage, strong sealing -All parts are hand inspected off the line before packaging and once again by our team before shipment -It has a high compressive strength and good sound insulation to ensure our driving comfort and safety If you are interested with any other air suspension parts, please click and save our store When Should We Replace Air Suspension: The car was subjected to excessive up, down, and left/right vibrations, nods during braking, and irregular tire wear An excessive tilt or swing of a car in a turn Wear or damage of final assembly housing, resulting in oil leakage of air suspension and affecting its performance If the car vibrates violently when it comes to an emergency stop while moving slowly ? Common Air Suspension Failure Inspection: 1.Abnormal Sounds When the air suspension strut is damaged,it will give out an abnormal sound. 2.Poor Handling Stability When the car passes over a rough road ,it bumps and cannot keep steady. 3.Air Leakage Leaking air、seal gasket failed. 4.Car Body Slant Under the condition of poor road (Bumpy Road),the body will collapse. 5.Irregular Tire Wear The air suspension sturt needs to be replaced if tyre surface has uneven wear marks. 6.Over Bend When you turn to brakes,tilt faster and the steering wheel will fail. Recommended replacement cycle: Since the average annual distance of the car is 20,000 kilometers, the replacement frequency is obtained every 4 years or 80.000km. In fact, the replacement frequency will vary depending on the car condition, road condition and shock absorber manufacturer.When driving a certain number of kilometers, we should take corresponding measures to ensure our driving safety. 20.000km: Please check your air suspension 80.000km: Need to replace your air suspension 100.000km: Please replace your air suspension as soon as possible OEM Part Number: 68204387, 68232648AA , 68204730AC , 68041137AF , 68204730AB , 68041137AG , 4877128AF, 68204387AA, 68204730AG 7L0698014 4L0698007, 7L0698853, 7L0698853A, 7L0698853B, 7L0698853C, 7L8616007, 7L8616007A, 7L8616007C, 7L8616007E, 7P0698014, 95835890101, 95835890102, 95835890300, 97035815302 Air Suspension Shock Absorber Operation: Air Suspension Shock absorbers are usually mounted between the lower control arms and the chassis. When a vehicle wheel strikes a bump, the wheel and suspension move upward in relation to the chassis. Upward wheel movement is referred to as jounce travel. Th is jounce action causes the spring to deflect or compress. Under this condition, the spring stores energy and springs back downward with all the energy absorbed when it defl ected upward. Th is downward spring and wheel action is called rebound travel. If this spring action were not controlled, the wheel would strike the road with a strong downward force, and the wheel jounce would occur again. Th erefore, some device must be installed to control the spring action, or the wheelwould bounce up and down many times after it hit a bump, causing passenger discomfort, directional instability, and suspension component wear. Shock absorbers are installed on suspension systems to control spring action. When a wheel strikes a bump and jounce travel occurs, the shock absorber lower tube unit is forced upward. Th is action forces the piston downward in the lower tube unit. Since oil cannot leak past the piston, the oil in the lower unit is forced through the piston orifi ces or valves to the upper oil chamber. These valves provide precise oil fl ow control and control the upward action of the wheel and suspension, which is referred to as a shock absorber compression stroke (Figure 5-2). When the spring expands downward in rebound travel, the lower shock absorber unit is also forced downward. When this occurs, the piston moves upward in the lower tube unit, and hydraulic oil is forced through the piston orifi ces or valves from the upper oil chamber to the lower oil chamber. Since the valves restrict oil flow with precise control, the downward suspension and wheel movement is controlled. When the shock absorber piston moves, oil is forced through the piston. Since the piston valves and orifi ces resist the fl ow of oil, friction and heat are created. Th e resistance of the oil moving through the piston must be calibrated as closely as possible to the spring’s deflection rate or strength. Wheels and suspension systems defl ect at many diff erent speeds, depending on the type and size of bump and the vehicle speed. Th e resistance of a shock absorber piston increases with the square of its speed. For example, if the wheel defl ection speed increases four times, the piston resistance is sixteen times as great. Th erefore, if a wheel strikes a large bump at high speed, the wheel defl ection and rebound can be eff ectively locked by the shock absorber. Shock absorber engineers prevent this action by precisely designing shock absorbervalves and orifi ces to provide enough friction to prevent the spring from overextending on the rebound stroke. Th ese piston valves and orifi ces must not create excessive friction, which slows the wheel from returning to its original position. Shock absorber pistons have many diff erent types of valves and orifi ces. In some pistons, small orifi ces control the oil flow during slow wheel and suspension movements. Stacked steel valves control the oil fl ow during medium speed wheel and suspension movements. During maximum wheel and suspension movements, larger orifi ces between the piston valves provide oil fl ow control. On other shock absorber pistons, the stacked steel valves alone provide oil flow control. Regardless of the piston orifi ce and valve design, the shock absorber must be precisely matched to absorb the spring’s energy. During fast upward wheel movement on the compression stroke, excessive pressure in the lower oil chamber forces the base valve open and thus allows oil to fl ow through this valve to the reservoir. Th e nitrogen gas provides a compensating space for the oil that is displaced into the reservoir on the compression stroke and when the oil is heated. Since the gas exerts pressure on the oil, cavitation, or foaming of the oil, is eliminated. When oil bubbles are eliminated in this way, the shock absorber provides continuous damping for wheel defl ections as small as 0.078 in (2.0 mm). A rebound rubber is located on top of the piston. If the wheel drops downward into a hole, the shock absorber may become fully extended. Under this condition, the rebound rubber provides a cushioning action. Package Includes: 2PCS for Air Suspension Compressor Pump & air suspension valve block Notes : Of all the suspension components, shock absorbers and struts contribute the most to ride quality. As the vehicle is driven over road irregularities, the shock absorbers or struts are continually operating to control the spring action and provide acceptable ride quality. It has been my experience that shock absorbers and struts usually wear out fi rst in suspension systems, because they are working every time a wheel strikes a road irregularity. Th erefore, you must understand not only shock absorber and strut operation but also how ride quality is aff ected if these componen Please double confirm the compatibility as well as the OEM number before purchasing. Instruction is not included. Professional installation is recommended. Item Specifics Placement on Vehicle Left Right Front Rear Package Box Single Weight(KG) 2.9 Included Hardware Compressor valve block Compression Range 10 - 200 PSI Gas Charged Shock Yes Drive Layout Front Engine 4WD Platform WK2 Material Iron Aluminium Alloy Rubber Color Silver Black Type Air Suspension Compressor Custom Bundle YES Return Policy 30 Days Free Return Manufacturer Warranty 1 Year Quantity 2PCS Fitment Type Direct Replacement OE Spec or Performance/Custom OE Spec Adjustable Yes Features Easy to Replace Brand brauchen-autoparts Manufacturer Part Number BR843037AP01 Interchange Part Number 7L0698853 7L0698853A 7L0698853B 7L8616007A 7L8616007C OE/OEM Part Number 68041137AF , 68204730AB , 68041137AG Superseded Part Number 4877128AF, 68204387AA, 68204730AG Payment We accept paypal only We only ship to verified PayPal addresses. Please make sure your PayPal address is verified and up to date before sending payment. We cannot change any address after checkout has been completed. Please make sure you submit your correct address! Shipping WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. 1. Package handling takes about 2 business days at our warehouse, so please make sure entering correct payment and shipping information before checking out. Once your payment is completed, we are not going to accept any more changes to your order. 2.All domestic orders will be shipped via USPS, UPS or Fedex from our US warehouse and usually arrives to your door in about 2-7 business days. 3.Local pick up is not available. 4.Orders to the rest of world may be shipped out from our warehouse in HongKong. 5.International Buyers C Please Note: a. Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyers responsibility. b. Please check with your country customs office to determine what these additional costs will be prior to bidding/buying. Returns 1.All of our brand new items come with a 60-Days money-back guarantee. 2.We define the item as defective only if it doesn't function as described, It is the buyer's responsibility to understand the item description before bidding. 3.We will replace the defective items, provided that they are in stock within the warranty period posted with the listing and the buyer return the original item and pay for the S&H cost for the replacement. 4.We will refund the purchase price if the replacement is not available or buyer prefers a refund and send the original item back at his/her own cost. 5.Shipping& handling cost are not refundable. 6.Man-made damage by abuse or wrong operation is not covered by this warranty. 7.No product liability insurance is assumed. 8.Refunds will be credited within 5 to 7 business days of receiving the return. When we've received and processed the return, we will refund the applicable amount minus any Recovery Fees (See Details Below) for the amount you paid for the item(s), plus any applicable sales tax. Contact Us Q: How do I pay for my purchase? A: MY store accepts PayPal. Q: When will the item be shipped out? A: This item will be shipped with 2 business day once payment completed. Q: Where is my tracking number? A: Please log on your account, click "my eBay"-->"my summary", or open your email box and find the shipping notification email. Q: How do I return an item? A: My tore accepts returns. Items must be returned within 60 days. Refunds will be given as money back. Please contact our customer service before you return an item. DESCRIPTION PAYMENT SHIPPING RETURN POLICY CONTACT US Shop Category Store Home Bumper air suspension Lift Supports Brake System Parts ◈ Brake Calipers ◈ Brake Drums & Brake Shoes ◈ Brake Pads & Brake Shoes Mass Air Flow Sensors Suspension Lift Kit Removal Tool Strut Mount Adjustable Control /Camber Arm complete strut coilover Shocks Struts dipstick Cylinder Piston Kit Horns & Sirens snorkel air intake Ballast Module Suspension+Strut+Bearing Clock Spring Coil Springs Other Hot Item Pair Front Air Suspension Shock Strut For Mercedes W222 S320 S350 S550 RWD 14-20 USD 423.60 Air Suspension Solenoid Valve Block For BMW 5 F07 GT F11 F01 F02 F04 740Li 750Li USD 24.98 Front Right Air Suspension Shock Strut For Mercedes W222 S350 S550 RWD 2014-2020 USD 253.53 Air Suspension Compressor Pump LR140034 For Land Rover Range Rover Sport 2014-17 USD 138.52 Pair Rear Air Suspension Spring Bags For Mercedes X164 GL450 GL550 W164 ML350 USD 63.45 New List Item New Mass Air Flow Meter MAF For 1998 1999-2003 Volkswagen Beetle L4 1.9L USD 29.59 For Ford Focus 2.0L 2.3L 2008-2011 Front Struts Brake Rotors Pads Sway Bars Kit USD 254.92 New MF4232 Fits Lexus ES300 1995-1996 V6 3.0L Mass Air Flow Meter MAF USD 62.59 For 2019-2023 RAM 2500 3500 Steel Front Bumper Face Bar Chrome w/ Fog Holes USD 659.99 For 12 13 14 15 2016 Chrysler Town & Country Brake Calipers Rear Left w/ Bracket USD 61.62 Help & Info Payment Policy Shipping Policy Return Policy FAQ About Us 2PC Air Suspension Compressor Valve Block For Jeep Grand Cherokee WK2 2011-2021 Introduction： Two front Air Suspesnion shock absorbers are connected from the front suspension to the chassis, and two rear Air Suspension shock absorbers are attached between the rear suspension and the chassis. Shock absorbers have three main purposes: 1. They control spring action and oscillations to provide the desired ride quality. 2. They help prevent body sway and lean while cornering. 3. They reduce the tendency of a tire tread to lift off the road, which improves tire life, traction, and directional stability. Because Air suspension shock absorbers control spring action, spring oscillations, and chassis oscillations, they contribute to vehicle safety and passenger comfort. If the shock absorbers are worn out, excessive chassis oscillations may occur, particularly on rough road surfaces. Th ese excessive chassis oscillations may result in loss of steering control. Worn-out shock absorbers also cause excessive body lean and sway while cornering, which may cause the driver to lose control of the vehicle. Shock absorbers are extremely important to providing longer tire life and improving vehicle handling, steering quality, and ride quality. Air suspension Shock absorber design is matched to the defl ection rate of the coil spring to control the spring action. Several diff erent types of shock absorbers are available for special service requirements. Fitting the Following vehicle: Jeep Grand Cherokee Jeep Grand Cherokee 75th 3.6L 2016 Jeep Grand Cherokee Altitude 3.6L 2018-2020 Jeep Grand Cherokee Blindada 5.7L 2017-2019 Jeep Grand Cherokee High 3.0L 2018-2020 Jeep Grand Cherokee High 3.6L 2018-2020 Jeep Grand Cherokee High 5.7L 2018-2020 Jeep Grand Cherokee Laredo 3.6L 2011-2020 Jeep Grand Cherokee Laredo 5.7L 2011-2013 Jeep Grand Cherokee Limited 3.0L 2014-2019 Jeep Grand Cherokee Limited 3.6L 2011-2020 Jeep Grand Cherokee Limited 5.7L 2011-2020 Jeep Grand Cherokee Overland 3.0L 2014-2019 Jeep Grand Cherokee Overland 3.6L 2011-2020 Jeep Grand Cherokee Overland 5.7L 2011-2020 Jeep Grand Cherokee SRT 6.4L 2013-2020 Jeep Grand Cherokee SRT8 6.4L 2012-2015 Jeep Grand Cherokee Summit 3.0L 2014-2019 Jeep Grand Cherokee Summit 3.6L 2014-2020 Jeep Grand Cherokee Summit 5.7L 2014-2020 Jeep Grand Cherokee Trackhawk 6.2L 2018-2020 Jeep Grand Cherokee Trailhawk 3.0L 2017-2019 Jeep Grand Cherokee Trailhawk 3.6L 2017-2020 Jeep Grand Cherokee Trailhawk 5.7L 2017-2020 Jeep Grand Cherokee Upland 3.6L 2019-2020 Ram 1500 Ram 1500 Big 3.0L 2014-2018 Ram 1500 Big 3.6L 2014-2018 Ram 1500 Big 5.7L 2013-2018 Ram 1500 Classic Big 3.6L 2019 Ram 1500 Classic Big 5.7L 2019 Ram 1500 Classic Express 3.6L 2019 Ram 1500 Classic Express 5.7L 2019 Ram 1500 Classic Laramie 3.0L 2019 Ram 1500 Classic Lone 3.6L 2019 Ram 1500 Classic Lone 5.7L 2019 Ram 1500 Classic SLT 3.0L 2019 Ram 1500 Classic SLT 3.6L 2019 Ram 1500 Classic SLT 5.7L 2019 Ram 1500 Classic ST 3.0L 2019 Ram 1500 Classic ST 3.6L 2019 Ram 1500 Classic ST 5.7L 2019 Ram 1500 Classic SXT 3.6L 2019 Ram 1500 Classic Special 5.7L 2019 Ram 1500 Classic Tradesman 3.0L 2019 Ram 1500 Classic Tradesman 3.6L 2019 Ram 1500 Classic Tradesman 5.7L 2019 Ram 1500 Classic Warlock 3.6L 2019 Ram 1500 Classic Warlock 5.7L 2019 Ram 1500 Express 3.6L 2014-2018 Ram 1500 Express 5.7L 2013-2018 Ram 1500 HFE 3.0L 2016-2017 Ram 1500 HFE 3.6L 2013-2016 Ram 1500 Laramie 3.0L 2014-2018 Ram 1500 Laramie 3.6L 2014-2018 Ram 1500 Laramie 5.7L 2013-2018 Ram 1500 Limited 3.0L 2015-2018 Ram 1500 Limited 5.7L 2015-2018 Ram 1500 Lone 3.0L 2014-2018 Ram 1500 Lone 3.6L 2014-2018 Ram 1500 Lone 5.7L 2014-2018 Ram 1500 Outdoorsman 3.0L 2014-2018 Ram 1500 Outdoorsman 3.6L 2013-2018 Ram 1500 Outdoorsman 5.7L 2013-2018 Ram 1500 R/T 5.7L 2013 Ram 1500 Rebel 3.6L 2015-2018 Ram 1500 Rebel 5.7L 2015-2018 Ram 1500 SLT 3.0L 2014-2018 Ram 1500 SLT 3.6L 2013-2018 Ram 1500 SLT 5.7L 2013-2018 Ram 1500 ST 3.0L 2015-2018 Ram 1500 ST 3.6L 2013-2018 Ram 1500 ST 5.7L 2013-2018 Ram 1500 SXT 3.0L 2015 Ram 1500 SXT 3.6L 2013-2018 Ram 1500 SXT 5.7L 2013-2018 Ram 1500 Special 5.7L 2014-2018 Ram 1500 Sport 3.6L 2017-2018 Ram 1500 Sport 5.7L 2013-2018 Ram 1500 Tradesman 3.0L 2014-2018 Ram 1500 Tradesman 3.6L 2013-2018 Ram 1500 Tradesman 5.7L 2013-2018 Evolution Related ： Jeep Grand Cherokee ZJ First generation (1993-1998) WJ Second generation (1999-2004) WK Third generation (2005-2010) WK2 Fourth generation (2011-present) Ram 1500 D/W First generation(1981-1993) BR Second generation(1994-2001) DR Third generation(2002-2008) DS Fourth generation（2009-2018） Fifth generation（2019-present） Platform Drive Layout: Front Engine-Four Wheel Drive Layout Advantage of Our Air Suspension: -The Original Size -Direct Replacement -Perfect Fit -Safe and Stable -Longer Life -Eliminating abnormal sound -After-sales Guarantee -Made of high quality raw materials, effectively reduce air leakage, strong sealing -All parts are hand inspected off the line before packaging and once again by our team before shipment -It has a high compressive strength and good sound insulation to ensure our driving comfort and safety If you are interested with any other air suspension parts, please click and save our store When Should We Replace Air Suspension: The car was subjected to excessive up, down, and left/right vibrations, nods during braking, and irregular tire wear An excessive tilt or swing of a car in a turn Wear or damage of final assembly housing, resulting in oil leakage of air suspension and affecting its performance If the car vibrates violently when it comes to an emergency stop while moving slowly ? Common Air Suspension Failure Inspection: 1.Abnormal Sounds When the air suspension strut is damaged,it will give out an abnormal sound. 2.Poor Handling Stability When the car passes over a rough road ,it bumps and cannot keep steady. 3.Air Leakage Leaking air、seal gasket failed. 4.Car Body Slant Under the condition of poor road (Bumpy Road),the body will collapse. 5.Irregular Tire Wear The air suspension sturt needs to be replaced if tyre surface has uneven wear marks. 6.Over Bend When you turn to brakes,tilt faster and the steering wheel will fail. Recommended replacement cycle: Since the average annual distance of the car is 20,000 kilometers, the replacement frequency is obtained every 4 years or 80.000km. In fact, the replacement frequency will vary depending on the car condition, road condition and shock absorber manufacturer.When driving a certain number of kilometers, we should take corresponding measures to ensure our driving safety. 20.000km: Please check your air suspension 80.000km: Need to replace your air suspension 100.000km: Please replace your air suspension as soon as possible OEM Part Number: 68204387, 68232648AA , 68204730AC , 68041137AF , 68204730AB , 68041137AG , 4877128AF, 68204387AA, 68204730AG 7L0698014 4L0698007, 7L0698853, 7L0698853A, 7L0698853B, 7L0698853C, 7L8616007, 7L8616007A, 7L8616007C, 7L8616007E, 7P0698014, 95835890101, 95835890102, 95835890300, 97035815302 Air Suspension Shock Absorber Operation: Air Suspension Shock absorbers are usually mounted between the lower control arms and the chassis. When a vehicle wheel strikes a bump, the wheel and suspension move upward in relation to the chassis. Upward wheel movement is referred to as jounce travel. Th is jounce action causes the spring to deflect or compress. Under this condition, the spring stores energy and springs back downward with all the energy absorbed when it defl ected upward. Th is downward spring and wheel action is called rebound travel. If this spring action were not controlled, the wheel would strike the road with a strong downward force, and the wheel jounce would occur again. Th erefore, some device must be installed to control the spring action, or the wheelwould bounce up and down many times after it hit a bump, causing passenger discomfort, directional instability, and suspension component wear. Shock absorbers are installed on suspension systems to control spring action. When a wheel strikes a bump and jounce travel occurs, the shock absorber lower tube unit is forced upward. Th is action forces the piston downward in the lower tube unit. Since oil cannot leak past the piston, the oil in the lower unit is forced through the piston orifi ces or valves to the upper oil chamber. These valves provide precise oil fl ow control and control the upward action of the wheel and suspension, which is referred to as a shock absorber compression stroke (Figure 5-2). When the spring expands downward in rebound travel, the lower shock absorber unit is also forced downward. When this occurs, the piston moves upward in the lower tube unit, and hydraulic oil is forced through the piston orifi ces or valves from the upper oil chamber to the lower oil chamber. Since the valves restrict oil flow with precise control, the downward suspension and wheel movement is controlled. When the shock absorber piston moves, oil is forced through the piston. Since the piston valves and orifi ces resist the fl ow of oil, friction and heat are created. Th e resistance of the oil moving through the piston must be calibrated as closely as possible to the spring’s deflection rate or strength. Wheels and suspension systems defl ect at many diff erent speeds, depending on the type and size of bump and the vehicle speed. Th e resistance of a shock absorber piston increases with the square of its speed. For example, if the wheel defl ection speed increases four times, the piston resistance is sixteen times as great. Th erefore, if a wheel strikes a large bump at high speed, the wheel defl ection and rebound can be eff ectively locked by the shock absorber. Shock absorber engineers prevent this action by precisely designing shock absorbervalves and orifi ces to provide enough friction to prevent the spring from overextending on the rebound stroke. Th ese piston valves and orifi ces must not create excessive friction, which slows the wheel from returning to its original position. Shock absorber pistons have many diff erent types of valves and orifi ces. In some pistons, small orifi ces control the oil flow during slow wheel and suspension movements. Stacked steel valves control the oil fl ow during medium speed wheel and suspension movements. During maximum wheel and suspension movements, larger orifi ces between the piston valves provide oil fl ow control. On other shock absorber pistons, the stacked steel valves alone provide oil flow control. Regardless of the piston orifi ce and valve design, the shock absorber must be precisely matched to absorb the spring’s energy. During fast upward wheel movement on the compression stroke, excessive pressure in the lower oil chamber forces the base valve open and thus allows oil to fl ow through this valve to the reservoir. Th e nitrogen gas provides a compensating space for the oil that is displaced into the reservoir on the compression stroke and when the oil is heated. Since the gas exerts pressure on the oil, cavitation, or foaming of the oil, is eliminated. When oil bubbles are eliminated in this way, the shock absorber provides continuous damping for wheel defl ections as small as 0.078 in (2.0 mm). A rebound rubber is located on top of the piston. If the wheel drops downward into a hole, the shock absorber may become fully extended. Under this condition, the rebound rubber provides a cushioning action. Package Includes: 2PCS for Air Suspension Compressor Pump & air suspension valve block Notes : Of all the suspension components, shock absorbers and struts contribute the most to ride quality. As the vehicle is driven over road irregularities, the shock absorbers or struts are continually operating to control the spring action and provide acceptable ride quality. It has been my experience that shock absorbers and struts usually wear out fi rst in suspension systems, because they are working every time a wheel strikes a road irregularity. Th erefore, you must understand not only shock absorber and strut operation but also how ride quality is aff ected if these componen Please double confirm the compatibility as well as the OEM number before purchasing. Instruction is not included. Professional installation is recommended. Payment Shipping Returns Contact Us We accept paypal only We only ship to verified PayPal addresses. Please make sure your PayPal address is verified and up to date before sending payment. We cannot change any address after checkout has been completed. Please make sure you submit your correct address! WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. 1. Package handling takes about 2 business days at our warehouse, so please make sure entering correct payment and shipping information before checking out. Once your payment is completed, we are not going to accept any more changes to your order. 2.All domestic orders will be shipped via USPS, UPS or Fedex from our US warehouse and usually arrives to your door in about 2-7 business days. 3.Local pick up is not available. 4.Orders to the rest of world may be shipped out from our warehouse in HongKong. 5.International Buyers C Please Note: a. Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyers responsibility. b. Please check with your country customs office to determine what these additional costs will be prior to bidding/buying. 1.All of our brand new items come with a 60-Days money-back guarantee. 2.We define the item as defective only if it doesn't function as described, It is the buyer's responsibility to understand the item description before bidding. 3.We will replace the defective items, provided that they are in stock within the warranty period posted with the listing and the buyer return the original item and pay for the S&H cost for the replacement. 4.We will refund the purchase price if the replacement is not available or buyer prefers a refund and send the original item back at his/her own cost. 5.Shipping& handling cost are not refundable. 6.Man-made damage by abuse or wrong operation is not covered by this warranty. 7.No product liability insurance is assumed. 8.Refunds will be credited within 5 to 7 business days of receiving the return. When we've received and processed the return, we will refund the applicable amount minus any Recovery Fees (See Details Below) for the amount you paid for the item(s), plus any applicable sales tax. Q: How do I pay for my purchase? A: MY store accepts PayPal. Q: When will the item be shipped out? A: This item will be shipped with 2 business day once payment completed. Q: Where is my tracking number? A: Please log on your account, click "my eBay"-->"my summary", or open your email box and find the shipping notification email. Q: How do I return an item? A: My tore accepts returns. Items must be returned within 60 days. Refunds will be given as money back. Please contact our customer service before you return an item. All right reserved.