Brakes - Brakes Squeal

46 Brakes squeal

46 09 06

2017130/6

November 20, 2009.

Supersedes Technical Service Bulletin Group 46 number 09-04 dated August 17, 2009 for reasons listed below.





Affected Vehicles





Condition
Complaints of brake squeal.

Technical Background

Production Solution

Not applicable.

Service

Note:
Before proceeding with any of the following steps, check the overall condition of the brakes. Verify that the brake discs and brake pads, which will be serviced according to the following procedure, will not reach their wear limit as a result of this procedure.

Warning:
Never use compressed air to clean brake dust from a brake system.

Perform the braking sequence as follows:

Brake disc, cleaning

1. With careful consideration of the traffic situation, perform 2-3 ABS stops (eg. from speeds above 50 MPH). Between each stop, please allow the brake components to cool. (Drive vehicle for more than 1 minute at speeds greater than 50 MPH.)

2. If necessary, perform additional ABS stops allowing cooling time between each stop (max. 5).

Brake pad, cleaning

1. With the wheels removed, mark the position of each brake disc in relation to the hub so that the brake discs can be reinstalled in the same position. Work on one brake at a time to avoid mixing up parts.

2. Some front/rear brake pads may have an adhesive (sticky) backing, which helps adhere the brake pad to the brake caliper. If the vehicle is equipped with this type of a pad, remove this sticky backing and any residual adhesive from the baking plate of the brake pad and brake caliper. Some front/rear brake pads have an anti-vibration backing plate (non-sticky). Do not remove this type of backing.





3. Clean face of the brake pad with sandpaper.





4. Slightly chamfer edges of brake pads with a file.

Brake caliper, cleaning

Note:
The following steps require a thin coat of Plastilube Moly3(R) high temperature grease to be applied to various parts of the brakes. This grease must never come in contact with:

^ The braking surface of the brake pads or brake discs.

^ The caliper piston.

These areas must always be free of grease.





1. Thoroughly clean all contact points (Figure 3) where the brake pad backing plate makes contact with the brake caliper and/or the brake carrier.

Reassembly

1. Reinstall brake discs in their original position. (See Brake pad, cleaning, Step 1.)

2. Prior to reinstalling the brake pads, apply a thin coat of Plastilube Moly3(R) high temperature grease to contact points (Figure 3) where the brake pad backing plate makes contact with the brake caliper and/or the brake carrier.

3. For brake pads that have springs (common on rear brake pads), apply a thin coat of Plastilube Moly3(R) high temperature grease to the springs where they make contact with the brake caliper.





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.