GM 88971198 Pedal,Brake

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The height of the brake pedal is the distance the pedal sits off the floor. If the pedal height is not within the specifications, it must be adjusted. To do this, loosen the locknut on the brake light switch and unscrew the switch until it doesn't contact the pedal arm. Before measuring the brake pedal height, make sure the pedal is in the fully-returned position. Measure the pedal height and, if necessary, adjust it by loosening the locknut on the pedal pushrod and turning the pushrod to achieve the proper height. When the proper height has been obtained, tighten the locknut securely. Then, adjust the brake light switch. The free play is the pedal slack or the distance the pedal can be depressed before it begins to have any effect on the brake system. Before checking the brake pedal free play, depress the brake pedal several times (with the engine off). If the pedal free play is not within the specified range, check the adjustment of the brake light switch. If the brake light switch is properly adjusted, troubleshoot the brake system for the cause of excessive freeplay. This could be due to air in the hydraulic system, excessive clearance between the booster pushrod and the master cylinder piston, or excessive clearance between the rear brake shoes and the brake drums. With the parking brake released and the engine running, depress the pedal with normal braking effort and have an assistant measure the distance from the center of the pedal pad to the floor. If the distance is less than specified, troubleshoot the brake system.