Cutlass Supreme RWD V8-307 5.0L (1988)
Technical Service Bulletin # 335014
Date: 930901
Brakes - Information On Powermaster III Brake System
Group Ref.: Brakes
Corporate Ref. No.: 335014
Date: September, 1993
SUBJECT:
INFORMATION ON POWERMASTER III BRAKE SYSTEM
MODELS:
1988-91 BUICK REGAL
1988-91 OLDSMOBILE CUTLASS SUPREME
1988-91 PONTIAC GRAND PRIX
This bulletin provides supplemental information that will help correctly diagnose and resolve concerns with the Powermaster III Brake system on
1988-91 "W" cars with ABS. It also provides a listing of all kits available to service the Powermaster III unit. A technical assistance hotline
(1-800-523-0203) is available to further assist in problem resolution.
Condition # 1
Owners of some 1988-91 "W" cars equipped with ABS may experience a brake pedal return condition. The stop lamps may also stay illuminated in
conjunction with this concern.
Diagnostics:
A.
Check brake pedal free back travel when pulling back lightly on pedal (no more than 20 lbs. force).
B.
Check stop lamp switch adjustment. Check for stop lamps being illuminated without applying brakes. If stop lamps are not illuminated, measure
how far brake pedal travels until stop lamps illuminate.
C.
Make a normal brake apply and then a very slow release.
Result:
A.
Free back travel is more than 6 mm (1/4 in.).
B.
Stop lamps illuminate in less than 10 mm (3/8 in.) of pedal travel or are illuminated constantly
C.
Brake pedal does not return to its original position.
Corrective Action:
A.
Pull Powermaster III unit away from cowl. If push rod is not attached firmly, replace push rod retainer (P/N 18020694).
B.
Adjust stop lamp switch per Service Manual instructions.
C.
See corrective action Step # 1 below.
CORRECTIVE ACTION STEPS:
Step # 1 - Brake pedal does not return to its original position.
A.
Repair the unit with Powermaster Repair Kit P/N 18017614.
NOTE:
