GM Full-Size Trucks 1970-1979 Repair Guide

Adjustments

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DRUM BRAKES



These brakes are equipped with self-adjusters. No periodic manual adjustment is necessary. Refer to brake shoe removal and installation for initial adjustments.

DISC BRAKES



These brakes are self-adjusting. No adjustment is possible.

PEDAL TRAVEL



At reasonably frequent intervals, the brakes should be inspected for pedal travel, which is the distance the pedal moves toward the floor from a fully released position. Inspection should be made with the brake pedal firmly depressed (approximately 90 lbs.) while the brakes are cold.



Manual brakes - 4.5 in. (115mm)
 
Power brakes - 3.5 in. (90mm)
 

On power brake equipped vehicles, pump the pedal a minimum of 3 times with the engine off before making pedal travel checks. This exhausts all vacuum from the power booster or fluid from the hydro-boost accumulator.

Brake pedal adjustment is made by removing the cotter pin, nut and bolt from the pedal rod end and screwing the rod end in or out to achieve the proper pedal travel.

 
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