K 1500 Truck 4WD V8-5.7L VIN R (1997)
Diagnosis By Symptom
1. Apply the brake at least five times with the engine off to remove vacuum from the booster before making the check.
2. Measure the distance from the bottom of the steering wheel to the brake pedal.
a. Take the first measurement (A) with the brake pedal released.
b. Take the second measurement (B) after applying the brake pedal with about 445 Nm (100 lbs.) of force using a brake pedal effort gage.
c. Subtract measurement A from measurement B.
d. Compare the measurement with the specifications below:
Vacuum Booster ................................................................................................................................................................. 80 mm (3.1 inches)
Hydraulic Booster ........................................................................................................................................................... 110 mm. (4.3 inches)
Four-Wheel Disc Brakes .................................................................................................................................................... 102 mm (4 inches)
e. If brake pedal travel is excessive refer to the Brake System Diagnostic Chart.
