Brake Pedal Travel
NOTE:
Brake pedal travel is not adjustable. Most low brake pedal problems are caused by air in hydraulic system and improper rear brake adjustment. Bleed hydraulic system before performing procedure. See BLEEDING BRAKE SYSTEM
. Other less frequent causes of excessive pedal travel are incorrect power booster push rod length, worn linings, rear brake adjusters not operating, misadjusted parking brake, or a leak in hydraulic system. Following procedure determines if brake pedal travel is as specified.
- With engine off, pump brake pedal until all vacuum reserve is exhausted from power brake booster. A definite change in pedal feel will occur. Install Brake Pedal Effort Gauge (J-28662) onto brake pedal. Hook end of tape measure over top of brake pedal. Measure and record distance to rim of steering wheel.
- Apply 100 lbs. (45 kg) of force to brake pedal. Measure and record distance to rim of steering wheel again. Difference between measured values is brake pedal travel. See BRAKE PEDAL TRAVEL SPECIFICATIONS table.
- If brake pedal travel exceeds specification, ensure brake power booster piston rod length is correct and rear brakes are adjusted. See POWER BRAKE BOOSTER PISTON ROD . See REAR BRAKE SHOES. Recheck brake pedal travel. If brake pedal travel still exceeds specification, repair brake system.
BRAKE PEDAL TRAVEL SPECIFICATIONS
| Application | In. (mm) |
|---|---|
| Caprice, Impala SS & Roadmaster | 2.24 (57.0) |