Brake noise on AMG vehicles
Topic number

LI42.10-P-063502

Version

12

Function group

42.10 - Service brake

Date

7/1/25

Validity

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

Reason for change

Updating Adhesive/copper paste on backing plate

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 the complaint can be reproduced and at which axle or side the noises occur (ideally together with
the customer while driving).
b) Check the affected system for component wear, mechanical damage or localized overheating damage. Replace
damaged components as necessary.
c) Assess condition of brake rotors and pads per WIS and visually (i.e. long periods of stagnation, etc...).
d) Clean brake components free of brake dust and debris.
d) Secure vehicle on a lift.
1.
Start the engine and depress the brake pedal 3-4 times.
2.
Check each wheel to see if they turn freely by hand.
3.
If a wheel is not turning freely by hand, this needs to be addressed prior to re-assessing the noise concern.
e) Check whether, apart from this document, an additional document exists for the specific model in question, and if
so, work through it and then continue.
2. Specific Axle Work:
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NOTE: If the brake pad has a metal backing plate, there is no need to affix the adhesive film. Continue with applying
chamfer and brake paste as instructed below.
IMPORTANT: Be absolutely certain to not allow paste between friction surfaces of the pad and disc!
a) If the noises are coming from the front axle.
1.
2.

Remove brake linings of front axle.
Clean all contact points on brake lining backing plate, including the brake lining guide pins and brake caliper/carrier.
3.
Clean bonding surface (where pistons contact back of brake pad). Apply adhesive film to the backplate of the
piston-side brake lining where the piston contacts the pad backing plate. See picture "Adhesive and Paste Application Area". If adhesive is already installed on backing plate, you may gently scrape off and re-apply a new adhesive. In some instances the adhesive may be very carefully removed and Molykote applied instead.
4.
Chamfer edges (gently round off sharp leading edges) on brake pads. Some pads have vertical grooves, these
can be gently chamfered with a triangular file as well. See picture "Chamfering Technique".
5.
Apply Molykote to the sides of the backing plate. See picture "Adhesive and Paste Application Area".
6.
After installing the brake linings, actuate the brake for 30 seconds.
b) If the noises are coming from the rear axle.
1.
2.
3.
4.
5.

Remove brake pads of rear axle.
Clean all contact points on brake lining backing plate 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.
Chamfer edges (round off sharp leading edges) on brake pads. See picture "Chamfering Technique".
Grease contact points (red areas on attachment "Rear Pad Grease Area") between brake lining and guide of
brake caliper with Molykote.

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) If the vehicle is an AMG P3 Hybrid, switch off recouperation prior to bedding in brakes.
d) 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.
e) Finally drive approx. 3 miles to allow the system to cool.
f) Reassess noise.

Attachments
File

Description

Rear Pad Grease Area.png

Rear Pad Grease Area

Chamfering Technique.png

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Adhesive and Paste Application Area.jpg

Disclaimer

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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

A 001 989 87 51
09

Molykote