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If the car is riding lower than usual, making abnormal sounds, and its compressor won't start, it indicates the replacement of air suspension compressor.Accordingly, if the compressor has failed, there is usually an air leak somewhere in the air ride suspension that needs to be found and fixed before a new compressor is installed.
The air compressor is what provides the air suspension system with compressed air required for it to function. If you suspect that there is a problem, you should have proper vehicle suspension inspection by a professional technicians such as Eurobahn BMW MINI Mercedes-Benz Audi. They can determine if the vehicle needs an air suspension compressor replacement or repair.
that is why your suspension went down. is that just a bracket or the arm off of the level sensor? it will need to be repaired for the car to maintain correct level.
open the hood, look at the strut tower, you well see the three (3) bolts that hold the strut in place, do you see a lines on the center of the strut,? no, you have regular suspension?, if yes then you have air suspension.
If you have seen lower back several times but the car raised by itself before, then you have to replace air spring. I replaced those with Arnott air spring.
If you had this problem for the first time, your air spring will be fine. If you have 4 corners air spring and the front one blows air in and out, your pump is okay.
Then I will first replace air suspension relay which costs $30. And you will have to check air hose connection. Finally you could try to replace air pump.
The easiest fix is to hook up a scanner on the suspension test plug. This will give you a test to each sensor. Some models may even record a history of performance.
Underneath the car, someone can use soapy water and spray the air lines and suspension bags to test for leaks. There are venting solenoids on each wheel to level the car and a Master solenoid called a "dump" valve to release all of the air
The system is tied into the doorjam and trunklid switches which must be closed to allow the system to work. Escaping air should be easy enough to find.
all of the suspension is low or only one of the suspension?
if only one of the suspension very low... most the the problem is the air bellow in the suspension strut crack.. need to replace new suspension strut.
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