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Introduction： Best autoparts Best choice of motor parts 3PCS Rear Air Suspension Spring Air Compressor For Mercedes W251 R320 R350 R500 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: Mercedes-Benz R-Class W251 R320 Bluetec Wagon 4-Door 3.0L 2009 R320 CDI Wagon 4-Door 3.0L 2007-2008 R350 4Matic Wagon 4-Door 3.5L 2006-2013 R350 Base Wagon 4-Door 3.5L 2008-2013 R350 Bluetec 4Matic Wagon 4-Door 3.0L 2010-2013 R500 Base Wagon 4-Door 5.0L 2006-2008 R500 Premium Wagon 4-Door 5.0L 2006 R500 Sport Wagon 4-Door 5.0L 2006-2008 R550 4Matic Wagon 4-Door 5.5L 2008 R63 AMG Base Wagon 4-Door 6.3L 2007 Evolution Related ： Mercedes-Benz R-Class W251 First generation (2006-2013) Mercedes-AMG R63 AMG (2007) 6.2 L M156 V8 Engine The AMG Version of the W251 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 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: Rear Air Suspension Spring Bag: 2513200025,2513200325,2513200425 Air Suspension Compressor Pump: 2513201204,2513201304,2513202004 2513202104,2513202704,2513202604 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 Rear Left & Right Air Suspension Spring Bag & 1PC Air Suspension Compressor Pump 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 Type Air Suspension Strut Fitment Type Direct Replacement Package Box Single Weight(LB) 18.298 Upper Mounting Isolator Included No Isolator Required Lower Mounting Isolator Included No Isolator Required Upper Mount Type Stud Lower Mount Type Base Cup Included Hardware None Drive Layout Front Engine RWD & 4WD Platform W251 Custom Bundle Yes Material Iron Quantity 3PCS Manufacturer Warranty 1 Year OE Spec or Performance/Custom OE Spec Adjustable Yes Features Sealed Brand brauchen-autoparts Manufacturer Part Number BR840463AP01 Interchange Part Number Air Suspension Spring Bag, Air Ride Spring Bag OE/OEM Part Number 2513200025,2513200425,2513200325,2513202604 Superseded Part Number 2513201204,2513201304,2513202004,2513202104,2513202704 Return Policy 30 Days Free Return Or Exchange Payment Paypal, Visa, and MasterCard are the accepted forms of payment. Please use the eBay checkout system when paying for your order. Immediate payment is required for all orders. Shipping WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov Proposition 65 requires businesses to provide warnings to Californians about significant exposures to chemicals that cause cancer, birth defects or other reproductive harm. (1).Warehouse is located in Los Angeles, California, where local pickup transaction is temporarily not available. (2).Shipping services only cover 48 states and Washington DC in US Continental, while most of the time Alaska, Hawaii, Puerto Rico, American Samoa, U.S. Virgin Islands, Northern Marianas, Guam are not deliverable. (3).USPS PO Box, APO Army Post Office, FPO Fleet Post Office addresses are not available. (4).Global Shipping Program is temporarily not available due to the reason for package dimensions. (5).We usually need a 1-2 business day as handling time for packaging and shipping scheduling. Estimated delivery dates should be 4-6 business days after your payment is received. (6).Your auto parts sometimes might be shipped with two or more separated packages due to weight limitation, please keep patient with no Item Not Received claim or Return request filed until by all of your items are received. (7).Seller is required to purchase signature confirmation to be protected if a buyer reports an item not received or opens a payment dispute if the order has a total cost (including shipping costs and any taxes) of $750 or more. Returns (1).Most of items support 60 Days Money Back Guarantee. (2).Refunds will be credited within 2 or 3 business days after returned item(s) is received. Contact Us Any question, please contact us by email, we will try our best to solve it, thanks Warranty Items valued over $15 on eBay that include a warranty or service contract must contain additional details in seller's listing description. 10 Year Warranty Terms and Procedures (1).The warranty terms only apply to the auto parts purchased from CARMASUSPENSIONS, which only includes suspension kit, control arm, tie rod end, ball joint, sway bar, stabilizer link, pitman arm, idler arm, steering center link. (2).CARMASUSPENSIONS carries no warranty responsibilities for any auto parts removing fees, installation fees, consulting fees, labor costs, towing charges, rental car reimbursements. (3).The stated 10 year warranty is limited to only one brand new replacement for each part purchased during 10 year warranty time period. (4).CARMASUSPENSIONS promises free replacement due to quality defects or item not as described issues within 90 calendar days from the date when buyers receive their items in the situation when buyers are willing to provide convictive proofs or professional diagnose report if required, otherwise CARMASUSPENSIONS has the right to refuse any replacement requests. (5).CARMASUSPENSIONS promises free replacement due to quality defects or item not as described issues after 90 calendar days from the date when buyers receive their items in the situation when buyers promise to prepay 15% of the original item sales price as postage for replacement, otherwise CARMASUSPENSIONS has the right to refuse any replacement requests. (6).CARMASUSPENSIONS carries no warranty responsibilities for any replacement due to car accidents, drag racing, unprofessional replacement, road hazard, disassembly. (7).Anyone who attempts to execute 10 year warranty procedures must be the original purchaser of the item(s), otherwise 10 year warranty terms void immediately. (8).Anyone who attempts to execute 10 year warranty procedures must provide screenshot of his or her original eBay order details if required, including buyer user name, shipping address, item title, item id, final sales price. (9).CARMASUSPENSIONS has the final power of interpretation of the above 10 Year Warranty Terms and Procedures. Best autoparts Best choice of motor parts DESCRIPTION PAYMENT SHIPPING RETURN POLICY CONTACT US 3PCS Rear Air Suspension Spring Air Compressor For Mercedes W251 R320 R350 R500 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: Mercedes-Benz R-Class W251 R320 Bluetec Wagon 4-Door 3.0L 2009 R320 CDI Wagon 4-Door 3.0L 2007-2008 R350 4Matic Wagon 4-Door 3.5L 2006-2013 R350 Base Wagon 4-Door 3.5L 2008-2013 R350 Bluetec 4Matic Wagon 4-Door 3.0L 2010-2013 R500 Base Wagon 4-Door 5.0L 2006-2008 R500 Premium Wagon 4-Door 5.0L 2006 R500 Sport Wagon 4-Door 5.0L 2006-2008 R550 4Matic Wagon 4-Door 5.5L 2008 R63 AMG Base Wagon 4-Door 6.3L 2007 Evolution Related ： Mercedes-Benz R-Class W251 First generation (2006-2013) Mercedes-AMG R63 AMG (2007) 6.2 L M156 V8 Engine The AMG Version of the W251 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 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: Rear Air Suspension Spring Bag: 2513200025,2513200325,2513200425 Air Suspension Compressor Pump: 2513201204,2513201304,2513202004 2513202104,2513202704,2513202604 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 Rear Left & Right Air Suspension Spring Bag & 1PC Air Suspension Compressor Pump 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 Type : Air Suspension Strut Fitment Type : Direct Replacement Package : Box Single Weight(LB) : 18.298 Upper Mounting Isolator Included : No Isolator Required Lower Mounting Isolator Included : No Isolator Required Upper Mount Type : Stud Lower Mount Type : Base Cup Included Hardware : None Drive Layout : Front Engine RWD & 4WD Platform : W251 Custom Bundle : Yes Material : Iron Quantity : 3PCS Manufacturer Warranty : 1 Year OE Spec or Performance/Custom : OE Spec Adjustable : Yes Features : Sealed Brand : brauchen-autoparts Manufacturer Part Number : BR840463AP01 Interchange Part Number : Air Suspension Spring Bag, Air Ride Spring Bag OE/OEM Part Number : 2513200025,2513200425,2513200325,2513202604 Superseded Part Number : 2513201204,2513201304,2513202004,2513202104,2513202704 Return Policy : 30 Days Free Return Or Exchange Payment Shipping Returns Contact Us Warranty Paypal, Visa, and MasterCard are the accepted forms of payment. Please use the eBay checkout system when paying for your order. Immediate payment is required for all orders. WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov Proposition 65 requires businesses to provide warnings to Californians about significant exposures to chemicals that cause cancer, birth defects or other reproductive harm. (1).Warehouse is located in Los Angeles, California, where local pickup transaction is temporarily not available. (2).Shipping services only cover 48 states and Washington DC in US Continental, while most of the time Alaska, Hawaii, Puerto Rico, American Samoa, U.S. Virgin Islands, Northern Marianas, Guam are not deliverable. (3).USPS PO Box, APO Army Post Office, FPO Fleet Post Office addresses are not available. (4).Global Shipping Program is temporarily not available due to the reason for package dimensions. (5).We usually need a 1-2 business day as handling time for packaging and shipping scheduling. Estimated delivery dates should be 4-6 business days after your payment is received. (6).Your auto parts sometimes might be shipped with two or more separated packages due to weight limitation, please keep patient with no Item Not Received claim or Return request filed until by all of your items are received. (7).Seller is required to purchase signature confirmation to be protected if a buyer reports an item not received or opens a payment dispute if the order has a total cost (including shipping costs and any taxes) of $750 or more. (1).Most of items support 60 Days Money Back Guarantee. (2).Refunds will be credited within 2 or 3 business days after returned item(s) is received. Any question, please contact us by email, we will try our best to solve it, thanks Items valued over $15 on eBay that include a warranty or service contract must contain additional details in seller's listing description. 10 Year Warranty Terms and Procedures (1).The warranty terms only apply to the auto parts purchased from CARMASUSPENSIONS, which only includes suspension kit, control arm, tie rod end, ball joint, sway bar, stabilizer link, pitman arm, idler arm, steering center link. (2).CARMASUSPENSIONS carries no warranty responsibilities for any auto parts removing fees, installation fees, consulting fees, labor costs, towing charges, rental car reimbursements. (3).The stated 10 year warranty is limited to only one brand new replacement for each part purchased during 10 year warranty time period. (4).CARMASUSPENSIONS promises free replacement due to quality defects or item not as described issues within 90 calendar days from the date when buyers receive their items in the situation when buyers are willing to provide convictive proofs or professional diagnose report if required, otherwise CARMASUSPENSIONS has the right to refuse any replacement requests. (5).CARMASUSPENSIONS promises free replacement due to quality defects or item not as described issues after 90 calendar days from the date when buyers receive their items in the situation when buyers promise to prepay 15% of the original item sales price as postage for replacement, otherwise CARMASUSPENSIONS has the right to refuse any replacement requests. (6).CARMASUSPENSIONS carries no warranty responsibilities for any replacement due to car accidents, drag racing, unprofessional replacement, road hazard, disassembly. (7).Anyone who attempts to execute 10 year warranty procedures must be the original purchaser of the item(s), otherwise 10 year warranty terms void immediately. (8).Anyone who attempts to execute 10 year warranty procedures must provide screenshot of his or her original eBay order details if required, including buyer user name, shipping address, item title, item id, final sales price. (9).CARMASUSPENSIONS has the final power of interpretation of the above 10 Year Warranty Terms and Procedures. All rights reserved.