Brakes - Moan On Acceleration Or Low Speed Turns
46 Brakes make moaning or "muh" noise when accelerating from stop or turning at slow speeds
46 13 32
2016681/8
March 18, 2013
Supersedes Technical DIAGNOSIS AND REPAIR Group 47 number 10-01 dated July 15, 2010 for reasons listed below.
Vehicle Information
Condition
^ "Muh" sound or moaning noise coming from the front brakes (FNRG) in the following conditions:
^ Slowly pulling away after a stop.
^ While turning at low speeds.
^ The performance of the brakes is not compromised.
Technical Background
The pistons in the calipers in certain vehicles may not retract far enough, which may leave contact between the rotor and pad. This contact may cause
a "muh" sound or moaning noise in low speed conditions.
Production Solution
New caliper piston seals have been developed to allow the pistons to retract further.
483
Service
Install the new caliper piston seal (4E0698471A) according to the instructions in Repair Manual >> Chassis >> 47 Brakes - Hydraulic components
>> Front Brake Calipers >> Front Brake Calipers, FNR and G60, Servicing.
Note:
Use of unapproved assembly lubricant will decrease effectiveness of new seal. Only use new brake fluid conforming to US-Norm FMVSS 116
Dot 4 for installation of new caliper piston seal.
Warranty
Required Parts and Tools
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service
manuals for the latest information.
