Suspension - Thump Noise From Front Axle On Uneven Roads

Thumping noise from area of front axle when driving on uneven roads

Topic number LI32.22-P-051441

Version 2

Design group 32.22 Air suspension

Date 12-20-2011

Validity Model series 164 with code 489 (AIRMATIC) except AMG vehicles in VIN range between 164### #A 584636 and 164### #A 682631

Reason for change Remedy updated: Part number without Index 39

Complaint:
Thumping noise from area of front axle when driving on uneven roads

Cause:
Play in the torsion bushing of the air suspension strut on the front axle causes noise when driving on uneven roads

The noise only occurs in vehicles in the VIN range 164 ### #A 584636 to 164 ### #A 682631.

Remedy:
Replace air suspension strut.

Determine part number as per EPC.

Temporarily the part number was listed as ES1 39 for differentiation purposes - ES1 has now been deleted again.





Symptoms








Parts





WIS-References