Front Disc Brakes - High Pitched Squeak
File In Section: 5 - BrakesBulletin No: 56-50-06
Date: November, 1995
Subject:
Front Disc Brake Squeaks/Squeals (Install New Front Disc Pad)
Models:
1990-95 Chevrolet G Vans - Built Before VIN SF156737
1990-95 GMC Truck G Vans - Built Before VIN SF522888
with RPO's JB5 or JB7 Brakes
Condition
Some customers may experience a high pitched squeak/squeal coming from the front disc pads under light or moderate brake applications.
Cause
The above characteristic is commonly due to component sensitivity to moisture and contaminates.
Correction
A revised front disc pad with a new insulator material DM7642 (Wolverine) has been released. The new insulator is permanently attached to the metal portion opposite side of the brake pad.
It is important to understand that the new material may not totally eliminate brake noise. It may however reduce the noises to a level which is more acceptable.
Because of strict design requirements, the disc brake pads on vehicles used today consist of a semimetallic-resin mixture which may cause an occasional or intermittent high pitched squeak/squeal when brakes are light or moderately applied. Some brake noise may be characteristic. If the Dealer service department has demonstrated that the condition is a normal characteristic, the customer should be assured that this is normal and no repairs should be attempted.
Service Procedure
Reference the Brake Pad section for proper replacement procedures.
Important:
If the brake rotors need to be refinished, follow the procedures located in the Service Manual Reference Section 5B1.
Parts Information
P/N Description Qty
12370017 Front Disc Pads (JB5) 2
12370019 Front Disc Pads (JB7) 2
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation Labor Time
H0042 Use published labor operation time.