For 1990-2009 cars

# INFO. VARIOUS BRAKE NOISES WHEN APPLYING SRVC. BRAKE

#### SUBJECT: INFORMATION - VARIOUS BRAKE NOISES WHEN APPLYING SERVICE BRAKE (NORMAL CONDITION)

#### MODELS: 1994-98 BUICK SKYLARK 1994-98 CHEVROLET BERETTA, CAVALIER, CORSICA 1994-98 OLDSMOBILE ACHIEVA 1994-98 PONTIAC GRAND AM, SUNFIRE

WHEN APPLYING THE SERVICE BRAKE, VARIOUS BRAKE NOISES MAY BE HEARD SUCH AS A GRINDING, GRATING, ROUGHNESS OR WIRE BRUSH NOISE.

THESE NOISES MAY BE DUE TO SURFACE CORROSION ON DRUMS AND ROTORS IN HIGH HUMIDITY OR WET CONDITIONS AFTER VEHICLE IS NOT USED FOR A PERIOD OF TIME. THE TIME WHICH RESULTS IN CORROSION WILL VARY UPON TEMPERATURE AND HUMIDTY. THIS IS A NORMAL CONDITION.

PRIOR TO REMOVING OR REPLACING ANY BRAKE COMPONENTS, PERFORM FOUR (4) TO SIX (6) MODERATE SERVICE BRAKE APPLICATIONS FROM 25 - 0 MPH (40 - 0 KM/H) ALLOWING 2 MINUTES BETWEEN BRAKE APPLICATIONS TO ALLOW BRAKE COMPONENTS TO COOL DOWN. OWNERS MAY PERFORM THESE BRAKE APPLICATIONS AS NECESSARY AS LONG AS IT IS DONE IN A SAFE ENVIRONMENT.

IF THIS PROCEDURE DOES NOT ELIMINATE THE ABOVE MENTIONED CONDITIONS, REFER TO THE SERVICE MANUAL FOR THE RECOMMENDED BRAKE SERVICE PROCEDURES. DO NOT REPLACE BRAKE PADS UNLESS THERE IS AN OBVIOUS BRAKE PAD CONCERN.

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GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.

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