Functional Test

WARNING: This page is about a different variant/trim than selected.

With engine stopped, press brake pedal several times to deplete vacuum reservoir, then press pedal hard and hold it for 15 seconds. If pedal sinks, either master cylinder is bypassing internally, or brake system is leaking. Brake system is composed of master cylinder, lines, modulator, proportioning valve, creep aid system solenoid valves (CVT), calipers and wheel cylinders. Start engine with pedal pressed. If pedal sinks slightly, vacuum booster is operating normally. If pedal height does not vary, booster or check valve is faulty. With engine running, press brake pedal lightly. If brake pedal sinks more than .4" (10 mm) in 3 minutes, the master cylinder is faulty. A slight change in pedal height is normal. (The A/C compressor load changes the vacuum available to booster.)