Tools Required

J 28662 Brake Pedal Effort Gauge

Measure the brakes frequently for pedal travel. Pedal travel is the distance the pedal moves toward the floor from a fully released position. Most low brake pedal problems are caused by air in the hydraulic system. Bleed the system until all the air is purged from the system. Refer to Hydraulic Brake System Bleeding . Other less frequent causes of excessive pedal travel include the following conditions:

Use the following procedure in order to measure the brake pedal travel:

1. Turn the engine OFF.
2. Pump the brake pedal three times in order to exhaust the vacuum assist from the vacuum brake booster.



3. Install the J 28662 into the brake pedal.
4. Hook the end of a tape measure over the top edge of the brake pedal. Measure the distance from the top edge of the brake pedal to the rim of the steering wheel.
5. Depress the brake pedal with approximately 445 N (100 lbs) of force while the brakes are cold.
6. Remeasure the distance from the top edge of the brake pedal to the rim of the steering wheel. The pedal travel should not exceed 74 mm (2.91 in).