Brake noise on AMG vehicles
Topic number

LI42.10-P-063502

Version

7

Function group

42.10 - Service brake

Date

1/16/25

Validity

All AMG model designations with steel or ceramic brakes
(code B07)

Reason for change

Adding validities

Complaint
Noises/ squealing from the service brake in various driving situations and ambient conditions.

WIS-References
Document number

Title

Note

SI 00.00-P-0086A

Guidelines for queries relating to tech- Guidelines for queries relating to technical complaints
nical complaints

Cause
Frictional vibrations

Remedy
AMG brake systems are designed for high loads. This can result in noises under certain operating conditions and driving styles. Please refer to the Operator's Manual for further information such as care and maintenance instructions
(washing vehicle directly after heavy use and using approved cleaning agents).
These are dependent on speed, brake pressure or ambient conditions such as temperature and air humidity.
1. Beginning Diagnostics:
a) Check whether, apart from this document, an additional document exists for the model series in question, and if so,
work through it.
b) Check whether the complaint can be reproduced and at which axle or side the noises occur (ideally together with
the customer while driving).
c) Check the affected system for component wear, mechanical damage or localized overheating damage.
1.

Replace damaged components as necessary and re-assess noise concern.

d) Secure vehicle on a lift.
1.
2.

Start the engine and depress the brake pedal 3-4 times.
Check each wheel to see if they turn freely by hand.

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3.

If a wheel is not turning freely by hand, this needs to be addressed prior to re-assessing the noise concern.

e) Assess condition of brake rotors and pads per WIS and visually (i.e. long periods of stagnation, etc...).
2. Specific Axle Work:
a) If the noises are coming from the front axle => Affix linings with adhesive film (see attachments for front axle).
1.
2.
3.
4.

Remove brake linings of front axle.
Clean all contact points on brake lining and brake caliper/carrier.
Clean bonding surface (where pistons contact back of brake pad). Apply adhesive film to the backplate of the
piston-side brake lining. For 6 piston calipers, only in the area of the center piston. For other piston caliper configurations less than 6, apply where the piston(s) makes contact with the back of the pad.
After installing the brake linings, actuate the brake for 30 seconds.

b) If the noises are coming from the rear axle => Affix linings with adhesive film and grease the lining as per the specification (see attachments for rear axle).
1.
2.
3.
4.
5.

Remove brake pads of rear axle.
Cleaning all contact points on brake lining and brake caliper/carrier.
Grease contact points (red areas) between brake lining and guide of brake caliper with heat-resistant lubricating
paste.
Clean bonding surface (where pistons contact back of brake pad). Apply adhesive film to the backplate of the
piston-side brake lining.
IMPORTANT: Be absolutely certain to not allow paste between friction surfaces of the pad and disc!

3. Brake Bedding Process:
a) Before trip, the mileage incurred must be clarified with the customer (approx. 30 miles).
b) Select a suitable route so speeds of approximately 65 MPH can be achieved.
c) Brake the vehicle 15 times with a brake pressure of approx. 30 bar (have the passenger read it out using XENTRY)
from 62 MPH to 30 MPH (no emergency stops and no braking in the ESP control range). Maintain a cooling distance
of approx. 1 mile between brake applications.
d) Finally drive approx. 3 miles to allow the system to cool.
e) Reassess noise.

Attachments
File

Description

6 Piston Adhesive Location.png

6 Piston Adhesive Location

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Rear Pad Grease Area.png

Rear Pad Grease Area

Disclaimer
NOTE: The information contained in this document is intended for use by trained, professional technicians with the
knowledge to properly and safely perform diagnosis and repairs on Mercedes-Benz vehicles, using Mercedes-Benz
approved tools and equipment. It informs service technicians about conditions that could occur in certain vehicles and
provides information that could assist in proper vehicle diagnosis, service, or repair. It does not indicate that a defect
is present in any vehicle referenced in this document nor does it imply warranty coverage. DO NOT assume that a
symptom or condition, or a described cause of a symptom or condition, affects any particular vehicle or groups of vehicles, or that a described repair applies to any particular vehicle or groups of vehicles. There can be multiple causes
resulting in the same or similar symptoms or conditions described in this document, and trained professional service
technicians must use their diagnostic skills to make evaluations on a case-by-case basis. The information contained
in this document does not guarantee warranty coverage nor does it extend the vehicle’s warranty in any way.

Symptoms
Chassis/suspension > Brake system > Service brake > Noises > General
Chassis/suspension > Brake system > Service brake > Noises > Squeals
Chassis/suspension > Brake system > Service brake > Noises > Whirring/howling
Chassis/suspension > Brake system > Service brake > Noises > Makes noise

Parts
Part number

ES1 ES2 Designation

Quantity Note

3M F9469PC

Alternate Adhesive Transfer
Tape

1

A001 989 87 51

Heat-resistant lubricating paste