Brakes - Intermittent Pull Under Hard Braking
Group Ref.: BrakesBulletin No.: 315004
Date: January, 1994
SUBJECT:
INTERMITTENT PULL WITH A HARD BRAKE APPLY DURING NON-ABS STOP ON ABS EQUIPPED VEHICLES (REPLACE ABS VALVE BLOCK/PRESSURE MODULATOR VALVE)
MODELS:
1986-90 BUICK ELECTRA
1986-91 BUICK LESABRE
1988-90 BUICK RIVIERA, REATTA
1991 BUICK PARK AVENUE
1986-91 CADILLAC DEVILLE, FLEETWOOD
1988-90 CADILLAC ELDORADO, SEVILLE
1986-91 OLDSMOBILE NINETY-EIGHT, EIGHTY-EIGHT
1988-90 OLDSMOBILE TORONADO, TROFEO
1986-91 PONTIAC BONNEVILLE
EQUIPPED WITH ANTILOCK BRAKES
THIS BULLETIN IS BEING REVISED TO ADD THE 1991 MODEL YEAR FOR "C" AND "H" VEHICLES INCLUDING PART AND WARRANTY INFORMATION. PREVIOUS DIVISIONAL PUBLICATION NUMBERS WERE:
DIVISION BULLETIN NUMBER
BUICK 90-5-17
CADILLAC T-93-134
GM OF CANADA 315004R
OLDSMOBILE 90-T-213
PONTIAC 90-5-19
Some owners may comment on intermittent pull with a hard brake apply, but without ABS activation. The intermittent pull can be either to the left or right and only occurs with hard non-ABS stops.
This condition may be due to a base brake condition, loose suspension component, or the Antilock Brake System. When working on a vehicle with this condition, use the following procedure:
1. Inspect the base brake system. Check for loose or binding calipers, damaged rotors, or restricted brake lines. Refer to Section 5 of the applicable Service Information Manual for complete inspection and repair procedures.
2. Inspect the suspension system. Check for loose control arms, damaged struts, or bushings. Refer to Section 3 of the applicable Service Information Manual for complete inspection and repair procedures.
3. If nothing is found during the above inspections, replace the AntiLock brake system valve block, (pressure modulator valve for 1991 models). Follow the procedure in the appropriate Service Information Manual.
1986-87 C/H Models Valve Block ......... P/N 25530880
1988-90 C/H Models Valve Block ......... P/N 25533639
1988-90 E/K Models Valve Block ......... P/N 1646523
1991 C/H Models Pressure Modulator
Valve ................................... P/N 25559182
Parts are currently available from GMSPO.
WARRANTY INFORMATION For vehicles repaired under warranty, use:
Labor Operation Number: H2517 (For 1986-90 Model Years)
H2480 (For 1991 Model Year)
Labor Time: Use published labor operation time.