Brakes - Rotor Warranty Service Procedure: Overview

File In Section: 5 - Brakes

Bulletin No.: 23-50-05B

Date: November, 1997

INFORMATION

Subject:
Brake Rotor Warranty Service Procedure

Model:
1994-98 GM Passenger Cars

This bulletin outlines GM's procedures for brake rotor service for all applicable GM passenger cars and supersedes Corporate Bulletin Number 23-50-05A Section 5 - Brakes).

Important:
Rotors should only be turned when one or more of the following rotor surface conditions exist:

1. Severe Scoring - depth in excess of 1.5 mm (0.060 in.).
2. Pulsation Concerns from:
a. Thickness variation in excess of 0.025 mm (0.001 in.).
b. Corrosion on rotor braking surfaces.

Rotors are NOT to be resurfaced in an attempt to correct:
1. Noise/squeal.
2. Cosmetic corrosion.
3. Routine pad replacement.
4. Discoloration and/or "hard spots".