GM 88971198 Pedal,Brake

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The height of the brake pedal refers to how high the pedal is above the floor. When the specifications for the pedal height are not met, it needs to be adjusted. For this, loosen the locknut on the brake light switch and turn out the switch until it does not touch the pedal arm. Take care that before measuring pedal height, ensure that pedal is in fully return position. Measure its height and if necessary loosen locknut on pushrod of pedals and turn it around until you achieve required height. Tighten securely when correct height has been obtained. Then adjust brake light switch. Free play is also referred to as 'pedal slack' or how much further down can a pedal be pressed before it significantly affects braking action. To check for free-play in the brake pedal, depress the brake many times (engine off). If free play is not within specified values, check adjustment of brake light switch. If freeplay is excessive after making sure that your brake light switch is adjusted properly, fix your attention on your car's hydraulic system as it might have air in it already; excessive clearance between the booster push rod and master cylinder piston; or excessive clearance between rear brake shoes and drum brakes themselves ?. With parking brake released and engine running apply normal braking effort to depress the pedal while an assistant measures distance from center of pad to floor. Troubleshoot braking system if distance is less than specified length.