SERVICE MANUAL UPDATE SEC. 5 REVISED PARKING BRAKE ADJUST.

SUBJECT: SERVICE MANUAL UPDATE - SECTION 5 AND SECTION 5C - REVISED SERVICE PROCEDURE FOR PARKING BRAKE ADJUSTMENT

MODELS AFFECTED: 1991 LESABRE; 1992 LESABRES PARK AVENUE/PARK AVENUE ULTRA

This bulletin revises the "Parking Brake Adjustment" procedure for the 1991 LeSabre and 1992 LeSabre, Park Avenue/Park Avenue Ultra.

Please update your service manual(s) accordingly.

1991 BUICK LESABRE; 1992 BUICK LESABRE, PARK AVENUE/PARK AVENUE ULTRA

The following includes revisions to "Parking Brake Adjustment' in Section 5C, page 5C-7, of the 1991 Buick LeSabre Service Manual, and in Section 5, page 5-20, of the 1992 Buick LeSabre and Park Avenue/Park Avenue Ultra Service Manuals. The figures referenced in the following procedure refer to figures in your service manuals. Please update your service manuals accordingly.

PARKING BRAKE ADJUSTMENT

Figures 1 and 11 (1991 LeSabre Service Manual) Figure 16 (1992 LeSabre Service Manual) Figure 15 (1992 Park Avenue/ Park Avenue Ultra Service Manual) Tools Required: 1/8 inch drill bit 1/4 inch drill bit

Adjust

1. Adjust rear brakes; refer to SECTION 5C. 2. Apply and release parking brake five times to 1 0 clicks. Release park brake pedal. 3. Check park brake pedal for full release by turning ignition to "ON" and checking the "BRAKE" warning lamp. The light should be off. If the light is on and the brake appears to be released, operate pedal release lever and pull downward on the front parking brake cable to remove slack. 4. Raise vehicle and suitably support. Refer to SECTION 0A. 5. Remove access hole plug in rear brake backing plates. 6. Adjust park brake cable until a 1/8-inch drill bit can be inserted through access hole into space between shoe web and park brake lever. Satisfactory adjustment is indicated when a 1/8- inch bit will fit into the space, but a 1/4-inch bit will not. 7. Apply park brake to four clicks, and check rear wheel rotation. When you try to rotate the wheels by hand in a forward direction they should not move; in a rearward direction, they should drag or not move. 8. Release park brake and check for free wheel rotation. 9. Reinstall access hole plugs. 10. Lower vehicle.

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.