ChevyMgr

#00-05-22-002L: Disc Brake Warranty Service and Procedures - (Mar 26, 2009)

Subject: Disc Brake Warranty Service and Procedures

Models: 1999-2010 GM Passenger Cars and Light Duty Trucks

2003-2010 HUMMER H2

2006-2010 HUMMER H3

1999-2004 Isuzu Light Duty Trucks (Canada Only)

2005-2009 Saab 9-7X (Canada Only)

1999-2010 Saturn Vehicles (Canada Only)

EXCLUDING 2009-2010 Chevrolet Corvette ZR1


BRAKE WARRANTY
Brake Rotors:

• Brake rotor warranty is covered under the terms of the GM New Vehicle Limited Warranty. Reference the vehicle's warranty guide for verification.

• Rotors should not be refinished or replaced during normal/routine pad replacement.

• Rotors should not be refinished or replaced and is ineffective in correcting brake squeal type noises and/or premature lining wear out.

• Rotors should not be refinished or replaced for cosmetic corrosion. Clean up of braking surfaces can be accomplished by 10-15 moderate stops from 56-64 km/h (35-40 mph) with cooling time between stops.

• Rotors should not be refinished or replaced for rotor discoloration/hard spots.

• Rotors should be refinished NOT replaced for Customer Pulsation concerns. This condition is a result of rotor thickness variation, usually caused by LRO (wear induced over time and miles) or corrosion (Lot Rot).

• When rotor refinishing, only remove the necessary amount of material from each side of the rotor and note that equal amounts of material do not have to be removed from both sides on any brake system using a floating caliper.

• Rotors should be refinished for severe scoring -- depth in excess of 1.5 mm (0.060 in).


Important: If the scoring depth is more than 1.5 mm (0.060 in) after the rotor is refinished, it should be replaced.


• It is not necessary to replace rotors in pairs. Rotors may be replaced individually. However, caution should be exercised, as a variance in surface finish may cause a brake pull condition.

• New rotors should not be refinished before installation. Original equipment rotor surfaces are ground to ensure smooth finish and parallelism between mounting and friction surfaces. If a new rotor has more than 0.050 mm (0.002 in) Lateral Run Out (LRO) when properly mounted on the hub, correct it using one of the following methods:

1. For hubless rotor designs, use the correction plate procedure found in the "GM Brake Service Procedure for Hubless Rotors" outlined in this bulletin.

2. For hubbed/trapped/captured rotor designs, refinish the rotor using an On-Car lathe and the procedure outlined in this bulletin.

• Never reuse rotors that measure under the Minimum Thickness specification. In this instance, the rotor should be replaced.