C 230 (203.040) L4-1.8L SC (271.948) (2005)
Torque Rod: All Technical Service Bulletins
Suspension - Front Axle Area Noise When Maneuvering
Knocking/creaking noises from area of front axle when maneuvering
Topic number
LI33.15-P-047471
Version
2
Design group
33.15 Axle links
Date
01-12-2010
Validity
Model series 203 except 4MATIC, 171, 209, 204
Reason for change
Damage code and WIS documents removed
Reason for block
Complaint:
Knocking/creaking noises from the area of the front axle when maneuvering (forwards/reverse) just before the steering reaches the limit stop.
Note:
Service brake is applied.
Cause:
Torsion of the hydro-mount in the strut rod.
When maneuvering, the hydro bushing end stop plug can collide with the inside of the outer sleeve.
In isolated cases, this surface can exhibit pinpoint wear depending on the operating conditions of the vehicle. This wear is caused by the end stop plug
resting against the outer sleeve during braking maneuvers.
As the end stop plug slides over the damaged area, fluctuations in friction pairing occur which cause the knocking/creaking noises.
Note:
The noise can generally be reproduced by driving a figure-8 in reverse. If the noises occur during this maneuver, the steering gear is not the cause of the
problem and must not be replaced. Please contact the TAC in urgent cases.
Remedy:
No remedy exists at the present time.
Symptoms