Brakes - Shudder or Pedal Pulsation

88oldsmobile22

SUBJECT: BRAKE PULSATION (SHUDDER, PULSATION VIBRATION WHEN SERVICE BRAKE IS APPLIED), REPLACING SLIDE PINS WITH NEW PINS

1982-88 CUTLASS CIERA, FIRENZA, 1985-88
MODELS/YEARS: NINETY-EIGHT, CUTLASS CALAIS, 1986-88 DELTA 88 AND 1980-85 OMEGA
NUMBER: 88-T-118

CORP. REF. NO.: 835017R

DATE: December 1988

SECTION: 5
Some of the above vehicles may experience a shudder or pulsation vibration when the service brake is applied. This is commonly referred to as "brake pulsation", and generally results from uneven wear of the brake rotors. Uneven rotor wear could be caused by high lateral slide forces of the brake calipers.

The caliper slide force may be reduced by replacing the current slide pins with new reduced diameter pins.

Whenever the caliper mounting bolts are serviced, the caliper mount bolt holes must be thoroughly cleaned and the area between the mount bolt bushings must be packed with silicone grease, part number 12345579 or equivalent.

Part Number
Cutlass Ciera Heavy Duty, 18016163
Delta 88, Ninety-Eight, (4 required per vehicle)
Omega

Cutlass Ciera Light Duty, 18016164
Firenza, Calais (4 required per vehicle)

Parts are currently available through GMSPO.

When replacing pins, refer to the vehicle service manual and the July, 1988 Service Guild (pg. 72) for the following:

- Proper rotor refinishing
- Proper caliper to knuckle clearance
- Proper lug nut torque sequence
- Only replace pads as necessary

IMPORTANT: If brake pads are replaced, only use the latest GM pads which were specifically developed for the vehicle being serviced.