PARKING BREAK ADJUSTMENT REVISED PROCEDURE

VEHICLES AFFECTED: All S/T Trucks --------------

In order to eliminate the need for a calibrated cable tension gauge, the procedure for parking brake adjust ent listed in Section 5 of the S Truck Service Manual has been revised.

The parking brake system must be readjusted whenever the parking brake cables have been disconnected, a cable has been replaced, or if the brake holding ability is not adequate. Before adjusting the parking brake, check the service brake condition. The service brakes must be properly adjusted as a base for the parking brake adjustment.

Service Procedure

Notice: Always make sure that the brakes are operational after performing brake work and before returning the vehicle to service.

. Block front wheels, lift and support rear axle.

. Set parking brake pedal at specified number of clicks: 2 wheel drive pickups and Jimmy/Blazer - 2 clicks. 4 wheel drive pickups and Jimmy/Blazer - 3 clicks.

. Loosen the equalizer until rear wheels spin freely, Figure 1. Some pickup trucks will have an intermediate cable guide bracket. This must be removed before making any parking brake cable adjustments.

. Tighten the equalizer nut until the rear wheels will not rotate without excessive force in a forward direction.

. Back off on the equalizer nut until there is moderate drag when the rear wheels are rotated in a forward direction. Reinstall the cable guide bracket if removed.

Note: Cables are not to be adjusted too tightly, as brake drag will result.

. Release parking brake and rotate the rear wheels. There should be no brake drag.

. Remove supports and 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.