説明
A luxury car should not announce its age with a sagging corner. When an Airmatic system starts to droop, it is never just about comfort: it is about control, alignment, and the quiet dignity of a ride that still feels engineered.
The Airmatic Sentinel is a pair of rear air spring bags engineered for the Mercedes R-Class W251 (part 2513200425). Each bag is built with the layered rubber construction and reinforced fittings that the Airmatic system expects, so the replacement integrates cleanly with your existing compressor and valve block. No guesswork, no adapters that sort of fit.
Fit the pair, clear the fault code, and the W251 settles back to factory stance. The ride height returns, the rear end tracks true, and the car stops asking for attention on every bump.
The best suspension repair is the one you forget happened.
The kit also respects the reality of the job: each bag arrives ready to bolt in, with the bellows protected for shipping so no crease or fold weakens the rubber before it is even fitted. For shops that quote Airmatic work every week, that consistency translates into fewer comebacks and happier owners.
Key Features
- ✦ Direct OE-style replacement for Mercedes R-Class W251 rear air springs (2513200425)
- ✦ Pair set, so both rear corners are refreshed at once
- ✦ Layered rubber bellows built for long service life under load
- ✦ Reinforced fittings engineered to seat with the factory Airmatic hardware
- ✦ Restores factory ride height and stabilizes rear-end tracking
- ✦ Compatible with the existing W251 compressor and valve block
Technical Specifications
- Compatibility: Mercedes R-Class W251 (2513200425)
- Position: Rear left + rear right (pair)
- Type: Airmatic air spring bag
- Construction: Layered rubber bellows with reinforced end fittings
- OE Reference: 2513200425
- Install: Bolt-on with factory hardware; air lines reconnect to OEM ports
- Package: 2 pieces per set
Application Scenarios
This kit serves W251 owners who have watched the rear of the car sink over time: R320, R350, R500 and AMG variants where the air springs have aged out. It is also the right call for independent shops and Airmatic specialists stocking proven replacements for one of the most common Mercedes suspension jobs of that generation.
Frequently Asked Questions
Q: Is this a direct fit for my W251?
A: It is engineered as an OE-style replacement for the W251 rear air spring position (2513200425). Confirm your chassis code and that you are replacing the rear bags, and the hardware lines up with the factory mount points.
Q: Do I need new air lines?
A: Usually not. The fittings reconnect to the existing Airmatic lines. Inspect the line ends for cracks while you are in there, but the kit itself is self-contained.
Q: Will this fix a sagging rear corner?
A: If the sag is caused by a leaking air spring, yes: replacing both rear bags restores ride height and stops the compressor from cycling overtime.
Q: Do I need to clear fault codes after install?
A: After installation and a full ride-height recalibration, clear the suspension fault codes with a compatible Mercedes diagnostic tool so the system relearns its reference levels.
Q: How long does installation take?
A: A competent workshop typically completes the pair in a few hours. If you are not confident working with air suspension, have a professional do the swap and the recalibration.
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Q: What is included in the kit?
A: The kit includes two rear air spring bags with their fittings, ready for installation. You reuse the factory air lines and mounting bolts unless they show wear, which is standard practice for this job.
Q: How do I know my compressor is still good?
A: If the compressor runs but the car keeps sinking, the springs are the usual culprit. If the compressor never runs or the car sits on the bump stops constantly, test the compressor and valve block before replacing the bags.
Q: Will these fit a W251 with factory rear AC?
A: Yes. The rear air spring position is independent of the climate equipment, and the kit mounts in the factory pockets on both chassis variants. If your car has a self-leveling option, the same spring geometry applies.
Q: How do I bleed the system after fitting?
A: The Airmatic system self-levels through the compressor and valve block. After fitting, run the engine, let the suspension cycle through its height settings, and then perform a recalibration with a Mercedes-compatible scanner to store the new reference values.
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