Brake Pedal Assy: Testing and Inspection

^ Tool Required:
- J 28662 Brake Pedal Effort Gage

Most low brake pedal problems are caused by air in the hydraulic system. Bleed the system until all air is purged. Refer to "BRAKE BLEEDING." Other less frequent causes of excessive pedal travel are excessively worn linings and hydraulic system leakage.

At reasonably frequent intervals, the brakes should be measured for pedal travel, which is the distance the pedal moves toward the floor from a fully released position.

Measure
Brake pedal travel as follows:
A. With engine "OFF" pump the brake pedal a minimum of three times to exhaust the vacuum assist from the power booster.
B. Install brake pedal effort gage J 28662 into brake pedal.
C. Hook the end of a tape measure over the top edge of the brake pedal and measure the distance to the rim of the steering wheel.
D. Depress the brake pedal with approximately 445 N (100 lbs.) of force while brakes are cold and remeasure. Pedal travel should not exceed 74 mm (2.91 inch).