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MERCEDES-BENZ/SMART A6383280501 AIR SPRING

MERCEDES-BENZ/SMART A6383280501 AIR SPRING

Product Specifications

Product quality
OEM Equivalent Grade
starstarstar
Wholesale price USD $20.04
Wholesale price CNY ¥138
bolt MOQ (Minimal order)
1 pcs
local_shipping Production time
50-55 days
package_2 Shipping Weight: —
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MERCEDES-BENZ/SMART A6383280501
MERCEDES-BENZ/SMART A6383280701
MERCEDES-BENZ/SMART A6383280601
MERCEDES-BENZ/SMART 6383280501
MILES DAB0021
Overview & Operating Principle
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The Rear Air Spring (Mercedes-Benz OEM A638 328 0501 / A6383280501) is the rear suspension air bellows for the Mercedes-Benz Vito (W638) and V-Class (W638) equipped with the optional rear AGILITY air suspension system. The air spring is a multi-ply reinforced rubber-and-fabric bellows element that replaces the conventional steel coil spring at the rear axle, supporting the vehicle corner weight on a regulated column of compressed air. The W638 AGILITY system adjusts rear ride height automatically in response to load, maintaining a level vehicle attitude regardless of cargo weight or passenger count — a critical function for a vehicle used in both passenger-carrying and commercial load roles. The OEM family covers three closely related numbers (A6383280501, A6383280601, A6383280701) representing minor production revisions of the same air spring body.

Mercedes OEM (primary)
A6383280501
Mercedes OEM (variant)
A6383280601
Mercedes OEM (variant)
A6383280701
Aftermarket (MILES)
DAB0021
Position
Rear axle — AGILITY air suspension
Application
Mercedes-Benz W638 Vito / V-Class
OEM Part Number Family
Mercedes-Benz OEM
A6383280501
✓ Primary — this part
Mercedes-Benz OEM
A6383280601
Variant revision — same spring
Mercedes-Benz OEM
A6383280701
Variant revision — same spring
Mercedes-Benz OEM (short)
6383280501
Without A-prefix — same part
MILES
DAB0021
Aftermarket cross-reference
W638 AGILITY Rear Air Suspension

The Mercedes-Benz W638 platform (Vito van and V-Class people carrier, 1996–2003) was offered with an optional rear air suspension designated AGILITY. Unlike the full AIRMATIC system fitted to contemporary Mercedes passenger cars — which uses air springs at all four corners with a central compressor and electronic control module — the W638 AGILITY system fits air springs at the rear axle only, supplementing or replacing the rear coil springs to provide automatic load-levelling. The system uses a dedicated rear air compressor and a simple height sensor to detect rear axle load changes and inflate or deflate the air springs to maintain a constant rear ride height. This is particularly useful on the Vito and V-Class, which regularly operate at widely varying load levels between empty and full seven or eight-seat passenger or cargo configurations.

The air spring bellows is the primary wear item in the system. It consists of a multi-ply reinforced rubber sleeve crimped between an upper mounting bracket and a lower piston. As the rear suspension moves through its travel, the lower piston rolls inside the sleeve, cycling the rubber material with every road input. Over time, the outer rubber layer degrades from ozone exposure and UV radiation, developing surface cracking that progressively penetrates the cord plies and eventually produces a pressure leak. On the W638, air spring failure is a common finding on vehicles with 150,000 km or more, and on vehicles stored outdoors in climates with high ozone levels (urban environments, high altitude) it can occur earlier.

Symptoms & Diagnostics
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⚠ A leaking air spring will destroy the rear compressor if not replaced promptly. On the W638 AGILITY system, the rear compressor is sized for an intermittent duty cycle. A slow air spring leak forces the compressor to run continuously to compensate for the pressure loss. Continuous compressor operation overheats the motor windings and valve assembly, causing premature compressor failure. A rear air spring fault that is not addressed within a few weeks of detection will typically result in both the air spring and the compressor requiring replacement — a significantly more expensive repair than addressing the air spring alone.
Rear of vehicle sitting noticeably lower on one or both sides after overnight parking — air spring leak — The most common presentation of a failed air spring on the W638. The compressor refills the spring during driving, so the vehicle may sit at normal height immediately after a journey but drop during the hours it is parked. Compare the rear ride height to a known-good vehicle or to the front axle height: a drop of more than 30–40 mm at either rear corner confirms a slow pressure leak. Apply soapy water to the spring sleeve surface and all air fittings with the system pressurised to confirm the leak location.
Rear compressor running continuously or cycling frequently during driving — slow air spring leak — On the W638, the compressor should only cycle briefly when the load changes significantly (loading or unloading passengers and cargo). A compressor that runs during normal steady-speed driving is compensating for continuous pressure loss from a leaking air spring or air line. Disconnect the air line at the spring fitting and pressurize the isolated spring from an external source — if it holds pressure, the leak is in the air line; if it cannot hold pressure, the spring sleeve or its fittings are leaking.
Harsh, jolting ride at the rear despite normal tyre pressures — spring deflated to near atmospheric — A rear air spring with a significant leak may deflate sufficiently between compressor cycles that the vehicle rides on the suspension jounce bumpers. The compressor partially compensates during driving, but the spring pressure is low enough that the ride quality at the rear is substantially worse than normal. This symptom may not trigger a warning light on the W638 if the drop is gradual and the control system accepts the partial height as within tolerance.
Visible surface cracking or ozone crazing on the rubber sleeve — proactive replacement indicated — With the rear wheel removed on each side, inspect the air spring sleeve for surface cracking, white chalking, or crazing of the outer rubber. Surface cracks that are superficial (do not open to reveal the underlying cord fabric) can be monitored. Cracks that have penetrated to the fabric reinforcement layer will develop into a pressure leak under the next high-load inflation cycle — replace the spring proactively rather than waiting for a failure that may occur at an inconvenient time or during a loaded journey.
Logistics & Customs
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International HS Code4016.99
EAEU Customs Code (TN VED)4016 99 970 9
Material classificationVulcanised rubber article with textile reinforcement
Country of ManufactureChina
PackagingIndividual protective packaging — rubber components must not be stored compressed or in contact with petroleum products, ozone sources, or direct sunlight during shipping and storage
Storage requirementsCool, dark, ozone-free environment; do not store near electric motors or fluorescent lighting (ozone sources)

Rubber air springs are classified under HS 4016.99 as other articles of vulcanised rubber. Storage conditions significantly affect service life of the replacement part — air springs must be stored in airtight packaging away from heat, UV, and ozone-generating equipment until fitted.

Vehicle Compatibility
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AGILITY rear air suspension was an option, not standard fitment on all W638 vehicles. Not all Mercedes-Benz Vito W638 and V-Class W638 vehicles were fitted with rear air suspension. The AGILITY system was an optional extra. Confirm that the specific vehicle is equipped with air suspension before ordering — vehicles without the AGILITY option will have conventional rear coil springs and do not use this part.
ModelBody CodeYearsPositionNotes
Mercedes-Benz VitoW6381996–2003Rear axle (both sides)AGILITY air suspension option — confirm fitted before ordering
Mercedes-Benz V-ClassW6381996–2003Rear axle (both sides)AGILITY air suspension option — confirm fitted before ordering

The three OEM numbers in this family (A6383280501, A6383280601, A6383280701) are all compatible with the W638 platform. Confirm the exact number from the original spring body if possible — all three are interchangeable within the AGILITY system. The left and right rear springs on the W638 use the same part number.

Installation Tips
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Difficulty: Moderate. The W638 rear air spring is accessible from under the vehicle after raising and supporting the rear axle. The procedure requires exhausting the air spring completely before disassembly to avoid sudden decompression during removal. A Mercedes-Benz scan tool or compatible diagnostic tool with W638 air suspension service access is required to command the suspension into service mode and perform the ride height relearn after installation. Estimated time: 45–90 minutes per side.

⚠ Exhaust the air spring completely before removal — never remove a pressurised air spring. The W638 AGILITY system maintains air pressure in the springs at all times when the vehicle is at normal ride height. Attempting to remove the spring without first exhausting the system risks sudden decompression, which can cause the spring to separate violently from its mounting and cause injury. Use the air suspension service function in the diagnostic tool to command the rear springs to vent, or use the compressor override to deflate. Do not rely on the vehicle sitting on chassis stands as confirmation of depressurisation — check with a pressure gauge at the air line fitting.
  1. 1
    Connect a diagnostic tool and command the W638 air suspension into service or exhaust mode. Allow the rear spring to fully vent to atmospheric pressure. Disconnect the vehicle battery to prevent the system from attempting to re-inflate during the repair. Raise the vehicle and support the body on chassis stands — support the rear axle independently with a workshop jack set to the normal ride height position to prevent excessive strain on brake hoses and ABS wiring.
  2. 2
    Disconnect the air line from the spring fitting. Press the collet release collar on the push-fit fitting and pull the air line free. Cap the disconnected air line immediately with a blanking plug — moisture and debris entering the air system through an uncapped line will corrode the compressor valve and the solenoid valves in the distribution block, causing expensive secondary failures.
  3. 3
    Unbolt the upper spring mounting bracket from the body and the lower mount from the rear axle. Note the orientation of the upper bracket relative to the body — photograph before removal. An incorrectly oriented spring will place the sleeve against adjacent components during suspension travel, causing abrasion failure of the new sleeve within weeks.
  4. 4
    Fit the new A6383280501 air spring in the correct orientation. Engage the upper bracket to the body mounting points and the lower mount to the rear axle in the reverse of removal. Do not fully tighten any fastener until both mounts are loosely in position — allow the spring to self-align before tightening. Torque upper and lower mounting bolts to OEM specification.
  5. 5
    Reconnect the air line until the push-fit collet clicks positively. Reconnect the battery. Use the diagnostic tool to inflate the spring to standard ride height. Apply soapy water to the spring sleeve, the push-fit air line connection, and all accessible fittings to confirm there are no leaks under operating pressure.
  6. 6
    Perform the W638 rear air suspension ride height relearn procedure. Place the vehicle on a level surface, unloaded. Use the diagnostic tool to command the ride height calibration routine. Confirm that the vehicle rear sits at the correct unladen height and that the compressor cycles normally under a simulated load test. Road test and recheck the spring fitting and connections for leaks after the first few kilometres.
Tools required: Mercedes-Benz compatible diagnostic tool with W638 air suspension service mode; workshop jack and chassis stands; push-fit air line blanking plug; soapy water for leak detection; torque wrench; pressure gauge (optional, for confirming depressurisation).
Frequently Asked Questions
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QAre A6383280501, A6383280601, and A6383280701 interchangeable?
Yes. All three OEM numbers describe the same rear air spring body for the W638 Vito/V-Class AGILITY system. The suffix digits (501, 601, 701) reflect minor production revisions — typically seal material updates or manufacturing process changes — that do not affect the external dimensions, mounting geometry, air fitting specification, or functional characteristics of the spring. Any of the three numbers is a correct replacement for the others. The replacement unit supplied under A6383280501 is built to the current production specification and is a direct fit for all W638 AGILITY applications regardless of which original number it carries.
QShould both rear air springs be replaced at the same time?
If both springs have covered comparable mileage and exposure, replacing both during the same service is recommended even if only one has failed. Both springs on the W638 rear axle age at the same rate from the same ozone, UV, and thermal cycling environment. A spring that survives alongside a failed companion is typically at the same stage of rubber fatigue and may fail within months of the first replacement. Replacing both during the same service access eliminates a repeat rear axle disassembly within a short period and ensures both corners have matching spring compliance, which is important for consistent ride height levelling response under load.
QIs a ride height relearn required after fitting a new air spring?
Yes. After replacing an air spring on the W638 AGILITY system, the ride height control module must relearn the reference position at the affected corner. The module stores a reference voltage from the ride height sensor corresponding to the standard unladen height — after a spring replacement, the mechanical relationship between the spring body and the sensor changes slightly, causing the module to target an incorrect height until the relearn is performed. The relearn is performed via the Mercedes-Benz diagnostic tool (or a compatible aftermarket tool with W638 body system access) with the vehicle on a level surface and at the standard unladen weight. Skipping the relearn causes the compressor to overwork as it hunts for an unachievable target height.
QIs white-label or custom branded packaging available for wholesale orders?
Yes. ok.parts supplies directly from the manufacturing facility and can accommodate neutral white-label packaging or branded packaging with your company logo, part numbers, and barcodes. For rubber air spring components, confirm that packaging includes airtight storage protection to preserve the rubber compound during transit and warehouse storage. Submit requirements through the inquiry form and our team will respond within 2 business days.
Frequently Replaced Together
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PartReferenceReason for Combined Replacement
Rear Air Suspension Compressor Mercedes-Benz W638 rear air compressor — confirm OEM PN by VIN The W638 AGILITY rear compressor is the component most commonly damaged by a failing air spring. A slow air spring leak that has been running undetected for weeks forces the compressor to run beyond its design duty cycle, overheating the motor windings and valve assembly. Inspect the compressor run time data in the control module fault history before completing the repair — if the module has logged frequent or continuous compressor activity events, the compressor should be replaced simultaneously with the spring to avoid a compressor failure within weeks of the spring repair. Replacing both together during the same service access is significantly more cost-effective than two separate repairs.
Rear Ride Height Sensor Mercedes-Benz W638 rear ride height sensor — left or right as applicable The ride height sensor on the W638 AGILITY system connects the rear axle to the body via a linkage rod with ball joints at each end. The sensor measures the relative position of the axle and body to signal the control module. At the mileage typical for W638 air spring failure (150,000 km or more), the sensor ball joints develop wear that produces erratic or inaccurate height signals, causing the compressor to hunt for the target height and run excessively even after the air spring is replaced. The sensor is accessible during spring replacement — inspect and replace if the ball joints show free play or corrosion. A height sensor fault code may appear as a secondary entry in the module alongside the air spring fault.
Air Line and Push-Fit Fittings W638 air suspension nylon line — confirm routing and length The nylon air lines on the W638 run from the rear compressor to the distribution fitting and then to each rear spring. The lines are routed along the chassis underside where they are subject to road debris contact, vibration-induced fatigue at clipped sections, and UV degradation of the outer coating. A hairline crack in the air line produces exactly the same slow leak symptom as a failed spring. Inspect the full line routing carefully — from the push-fit fitting at the spring back to the compressor — before and after the spring replacement. A leaking air line discovered after the spring is fitted and the system pressurised requires a repeat system vent and partial disassembly to correct.