iceman
08-26-2002, 10:32 AM
Front Disc Brake Pulsation (New Rotor Run-Out Specification and Correction Method)
1997-2002 Chevrolet Malibu
1997-1999 Oldsmobile Cutlass
1999-2002 Oldsmobile Alero
1999-2002 Pontiac Grand Am
This bulletin is being revised to update the correction information. Please discard Corporate Bulletin Number 00-05-23-002 (Section 5 -- Brakes).
Condition
Some customers may comment on a pulsation condition felt in the brake pedal and/or steering wheel during a brake apply. In some cases, it may be noted that the pulsation condition has reoccurred in 5,000-11,000 km (3,000-7,000 mi) after having had the brakes serviced, tires rotated or any type of servicing that required wheel removal.
Cause
Pulsation is the result of brake rotor thickness variation causing the brake caliper piston to move in and out of the brake caliper housing. This hydraulic "pumping/pulsing" effect is transmitted through the brake system and may be felt in the brake pedal. In severe cases, this condition may also transmit through the vehicle structure and other chassis system components such as the steering column or wheel. The major contributor to rotor thickness variation is excessive lateral run-out of the rotor, causing the brake pads to wear the rotor unevenly over time.
Confirm that the brake pads have the number 1417 printed on the edge of the pad backing plate (refer to the illustration). This indicates the correct brake pads have been previously installed. The brake pads contained in Front Pad Kit, P/N 18044437 are the only brake pads that should be used on these vehicles. If the number 1417 is not present, or if the number is not legible, replace the brake pads. If the correct pads were previously installed, verify the brake pad thickness. If the brake pad friction material thickness is 4.6 mm (0.18 in) or greater, re-use the pads. If the friction material thickness is less than 4.6 mm (0.18 in), install new brake pads contained in Front Pad Kit P/N 18044437.
If the rotor thickness is less than 25 mm (0.98 in), install a new rotor. If rotor thickness is greater than 25 mm (0.98 in), refinish the rotor.
Replace existing front brake rotors and pads, if necessary, with new components indicated in the table following the applicable Service Manual procedures and the service guidelines contained in Corporate Bulletin Number 00-05-22-002.
1997-2002 Chevrolet Malibu
1997-1999 Oldsmobile Cutlass
1999-2002 Oldsmobile Alero
1999-2002 Pontiac Grand Am
This bulletin is being revised to update the correction information. Please discard Corporate Bulletin Number 00-05-23-002 (Section 5 -- Brakes).
Condition
Some customers may comment on a pulsation condition felt in the brake pedal and/or steering wheel during a brake apply. In some cases, it may be noted that the pulsation condition has reoccurred in 5,000-11,000 km (3,000-7,000 mi) after having had the brakes serviced, tires rotated or any type of servicing that required wheel removal.
Cause
Pulsation is the result of brake rotor thickness variation causing the brake caliper piston to move in and out of the brake caliper housing. This hydraulic "pumping/pulsing" effect is transmitted through the brake system and may be felt in the brake pedal. In severe cases, this condition may also transmit through the vehicle structure and other chassis system components such as the steering column or wheel. The major contributor to rotor thickness variation is excessive lateral run-out of the rotor, causing the brake pads to wear the rotor unevenly over time.
Confirm that the brake pads have the number 1417 printed on the edge of the pad backing plate (refer to the illustration). This indicates the correct brake pads have been previously installed. The brake pads contained in Front Pad Kit, P/N 18044437 are the only brake pads that should be used on these vehicles. If the number 1417 is not present, or if the number is not legible, replace the brake pads. If the correct pads were previously installed, verify the brake pad thickness. If the brake pad friction material thickness is 4.6 mm (0.18 in) or greater, re-use the pads. If the friction material thickness is less than 4.6 mm (0.18 in), install new brake pads contained in Front Pad Kit P/N 18044437.
If the rotor thickness is less than 25 mm (0.98 in), install a new rotor. If rotor thickness is greater than 25 mm (0.98 in), refinish the rotor.
Replace existing front brake rotors and pads, if necessary, with new components indicated in the table following the applicable Service Manual procedures and the service guidelines contained in Corporate Bulletin Number 00-05-22-002.