2007-2011 Mercedes-Benz CLS550 4 Wheel Air Suspension Conversion Kit With Light Fix Module (MJ14FM)

Replaced Components
The 2007-2011 Mercedes-Benz CLS550 is built with the following suspension components: 2007-2011 Mercedes-Benz CLS550 Air Springs (x4)- (models with air suspension only). 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. 2007-2011 Mercedes-Benz CLS550 Struts (x2)- a type of shock absorber; has metal tubing filled with gas-charged hydraulic fluid that is connected to the wheel of a vehicle in order to reduce the effects of vertical travel on a rough surface which controls the bounciness, and therefore comfort, of a vehicle.; the air spring assembled on top of the strut is commonly referred to as an air strut. 2007-2011 Mercedes-Benz CLS550 Air Shocks (x2)– (models w/ AIRMATIC Dual-Control only). The air shocks are pumped up automatically to assist with the ride quality. These shocks contain a rubber bladder which is notorious for dry rotting, causing leaks in the shocks which inevitably leads to multiple failures in the air system. 2007-2011 Mercedes-Benz CLS550 Passive Hydraulic Shock Absorbers (x2)- (models w/o AIRMATIC Dual-Control only). A metal tubing filled with gas-charged hydraulic fluid that is connected to the wheel of a vehicle in order to reduce the effects of vertical travel on a rough surface which controls the bounciness, and therefore comfort, of a vehicle. 2007-2011 Mercedes-Benz CLS550 Coil Springs (x4)- (models w/o AIRMATIC). What we love! Coil springs hold the vehicle up but be careful, they are rated for and designed to work with the rest of the suspension system, so when you change air shocks to passive shocks, then you will need a different rated coil spring that works well with the new type of shocks. 2007-2011 Mercedes-Benz CLS550 Height Sensors (x4)- 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. 2007-2011 Mercedes-Benz CLS550 Air Lines- (models with air suspension only). Tubes that run from a compressor to the air struts which carry pressurized air to the air bags. 2007-2011 Mercedes-Benz CLS550 Compressor Assembly- (models with air suspension only). Creates/sends pressurized air to active suspension components. When the air suspension starts leaking, the compressor/pump starts working harder to try to keep the system inflated. By the time air suspension leaks down completely, sitting the vehicle on its tires, the compressor will either have failed or be well on its way to full failure. Buying replacement struts and taking the time to install them only to find out the compressor still needs to be replaced can be very frustrating, time-consuming, and expensive. 2007-2011 Mercedes-Benz CLS550 Suspension Control Module- a computer which is responsible for the operations of the air suspension system and maintaining the vehicles correct ride height. 2007-2011 Mercedes-Benz CLS550 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
If the 2007-2011 Mercedes-Benz CLS550 is unable to reach and maintain its proper ride height, a failed or leaking air suspension system may be to blame. Look for these common signs that indicate the suspension is going bad. A sudden uneven height difference between different sides of the CLS550 is commonly seen. One sagging end and one inflated end can make the CLS550 look like it's squatting down.  Some drivers notice a shifting lean from one side to the other. If not fixed in a timely fashion, these imbalances will wear out the air compressor. Once the air compressor stops working, a suspension warning light will turn on. An expensive direct replacement or repair is the only solution to advanced suspension failure.

OEM Replacement Cost
'+ Front Air Struts ($1,240/strut) ) + Rear Electronic Air Shocks ($580/shock) + Rear Air Spring ($1,190/spring) + Air Compressor Assembly ($380) = Over $6,400 (and that doesn't include replacing electronic components that are known to fail such as the height sensors).

Aftermarket Replacement Cost
'+ Front Air Struts ($840/strut) ) + Rear Electronic Air Shocks ($480/shock) + Rear Air Spring ($310/spring) + Air Compressor Assembly ($390) = Over $3,600 (and that doesn't include replacing electronic components that are known to fail such as the height sensors).