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1996-1999 Mercedes Benz S420 RWD Rear Hydraulic Suspension Conversion Kit (MW1RB)
1996-1999 Mercedes Benz S420 RWD Rear Hydraulic Suspension Conversion Kit (MW1RB)
1996-1999 Mercedes Benz S420 RWD Rear Hydraulic Suspension Conversion Kit (MW1RB)
1996-1999 Mercedes Benz S420 RWD Rear Hydraulic Suspension Conversion Kit (MW1RB)

1996-1999 Mercedes-Benz S420 RWD Rear Hydraulic Suspension Conversion Kit (MW1RB)

The 1996-1999 Mercedes Benz S420 RWD Rear Hydraulic Suspension Conversion Kit (MW1RB) is the perfect solution to your air suspension problems. Designed to be very affordable, you can convert your air suspension to use passive shocks and coil springs for less than the price of replacing one original equipment air spring.
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Convert Your Hydraulic Suspension To A Coil Spring Suspension. End Your Air Suspension Problems Forever...

Strutmasters 1996-1999 Mercedes Benz S420 Rear Conversion Kit is the perfect solution to your rear suspension problems. Designed to be very affordable, you can convert your rear suspension to use standard shocks/struts and coil springs for less than the price of replacing one hydraulic strut.

Conversion Kit Features

  • Saves Money
  • Replaces Your Hydraulic Struts
  • All New Components
  • Rides Great
  • No Modifications Required To Install
  • Easy To Install
  • Premium Springs

Air Suspension Conversion Kit Includes

  • 2 Rear Shocks
  • 2 Rear Springs
  • New Mounts
  • All Necessary
  • Detailed Instructions

This Conversion Kit Fits

1996 Mercedes S420 (RWD), 1997 Mercedes S420 (RWD), 1998 Mercedes S420 (RWD), 1999 Mercedes S420 (RWD)

Product Notes

  • Fits The W140 Chassis
  • Kit Does Not Fit 4-Matic Models with All-Wheel Drive


Replaced Components
The 1996-1999 Mercedes Benz S420 RWD is built with the following suspension components:

1996-1999 Mercedes Benz S420 RWD Hydro-Pneumatic Springs (x2)- Commonly referred to as air bags, a plastic and rubber bag that is fitted on top of the strut that uses pressurized air as a cushion instead of a metal coil spring to hold a vehicle off of the ground and off of its wheels. These are the number one cause of all air suspension leaks. All air springs all go bad at about the same rate. If one is leaking, the others will not be far behind. For a proper repair, all of them need to be replaced at the same time. If your model has hydraulic springs/struts, then it is filled with hydraulic fluid instead of air to adjust the height and dampening of the vehicle.

1996-1999 Mercedes Benz S420 RWD Electronic Shocks (x2)- shocks whose dampening capabilities are controlled by the suspension control module.

1996-1999 Mercedes Benz S420 RWD Height Sensors (x2)- a linkage located near each wheel of a vehicle with any electronic suspension that, either mechanically or electronically, constantly measures the height of the vehicle, and reports this information back to the control module so that the computer can identify if changes in height need to be adjusted accordingly. The ride height sensor is a moving part, and like all moving parts, they will eventually wear out.

1996-1999 Mercedes Benz S420 RWD Compressor- This vehicle is equipped with one air suspension compressor. The compressor is responsible for pumping up the air springs and shocks. When the air suspension starts leaking, the compressor is forced to run continuously to try and keep the air springs inflated. After a couple of days of running non-stop, the compressor will burn itself out. Replacing the compressor is a timely and expensive project to undertake.

1996-1999 Mercedes Benz S420 RWD Dryer Assembly- This vehicle is equipped with a dryer assembly. The dryer assembly is responsible for getting moisture out of the air lines. Once the air suspension parts start to leak, moisture will build up throughout the air system. Moisture damages the air suspension components from the inside out. The dryer must be replaced whenever the compressor is replaced to prevent further damage.

1996-1999 Mercedes Benz S420 RWD Suspension Control Module- This vehicle is equipped with a suspension control module. This module is the brain of the suspension system and it reads all of the signals that are being sent by the height sensors and determines if the vehicle needs to be raised or lowered.

1996-1999 Mercedes Benz S420 RWD O-rings- Although they are the least expensive parts of the air suspension, they are responsible for maintaining the seal where all of the air lines connect. Be sure to replace the O-rings when repairing any air suspension system.

Suspension Failure Signs
An inability to reach and maintain its proper ride height is an indicator that the 1996-1999 Mercedes-Benz S420 RWD has a failed or leaking air suspension system. Look for an uneven height difference between different sides of the S420. This may look like a sagging squat in the rear end of the vehicle. There may be a shifting lean from side to side. Any height variance will wear out the air compressor. An illuminated suspension warning light on the instrument cluster also indicates a failed suspension. The S420 RWD owner should get any suspension issue fixed as soon as it presents itself to avoid total failure.

OEM Replacement Cost

+ Rear Electronic Shocks ($180/shock)
+ Rear Hydro-Pnuematic Spring ($970)
+ Hydraulic Pump ($280)
= TOTAL: Over $2,580 (and that doesnt even include replacing electronic components that are known to fail such as the height sensors).


The assorted parts that comprise the air suspension system on the 96-99 Mercedes-Benz S420 RWD must always work together. When one component breaks, the entire system needs a repair. Strutmasters' air to non-air suspension conversion kit gets rid of this reliance for good. The kit, made in America, comes complete with two coil springs with mounts and two passive hydraulic fluid and gas shocks for the rear. The kit is installed in as little as one hour per wheel, thanks to detailed instructions. Online installation videos and tech support from ASE certified experts offers further assistance to customers. The quality parts are guaranteed by Strutmasters' Lifetime Limited Warranty. Lastly, the price of the coilover kit is a fraction of the costs of dealership direct replacement and individual aftermarket part replacement.
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