Road Test and Fluid Leaks

Fig. 2 Brake Diagnosis Chart:

When troubleshooting the hydraulic brake system, perform the following checks and inspections. If a malfunction still exists within the system, refer to the brake system diagnosis chart, Fig. 2, and BRAKE PEDAL FEEL DIAGNOSIS.

ROAD TESTING

When testing brakes, ensure the road is level and dry. Test brakes at both light and heavy pedal pressure. Do not lock up brakes or slide tires during a brake test.
Check the tires on the vehicle before performing a brake test. Tires should be equally inflated, identical in size and of equal tread pattern. Excessive camber and caster will cause the brakes to pull. An overloaded vehicle will also brake erratically.

FLUID LEAKS

Start engine and depress the brake pedal. If the pedal gradually falls under constant pressure, the hydraulic system may be leaking. Raise and support vehicle and check all tubing lines and backing plates for signs of leakage. It may be necessary to lift or remove the carpeting or floor mats to check for booster or master cylinder leakage.