Brake Pedal Travel Measurement & Inspection
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- With the ignition OFF and the brakes cool, apply the brakes 3-5 times, or until the brake pedal becomes firm, in order to deplete the brake booster power reserve.
- Install the Brake Pedal Effort Gauge (J-28662) to the brake pedal.
- Measure and record the distance from the brake pedal to the rim of the steering wheel; note the points of measurement. See Fig 1.
- Apply and maintain the brakes with 100 Lbs. (445 N) of force to the brake pedal, as indicated on the brake pedal effort gauge.
- While maintaining 100 Lbs. (445 N) of force to the brake pedal, measure and record the distance from the same point on the brake pedal to the same point on the rim of the steering wheel.
- Release the brakes and repeat steps 4 and 5 to obtain a second measurement. After obtaining a second measurement, proceed to next step.
- Average the first and second measurements recorded during the 2 applies of the brakes.
- Subtract the initial measurement, unapplied, from the averaged, applied measurement to obtain the brake pedal travel distance.
- For vacuum assist equipped, maximum brake pedal travel (measured with the ignition OFF, brake booster power assist depleted, and the brakes cool) is 2.56" (65 mm).
- For hydraulic assist equipped, maximum brake pedal travel (measured with the ignition OFF, brake booster power assist depleted, and the brakes cool) is 3.54" (90 mm).