Power Brake Unit
- With engine off, depress brake pedal several times and hold pedal down. Start engine. Pedal should move slightly toward floor. Continue to hold brake pedal down and turn off engine.
- Continue to hold brake pedal down longer than 30 seconds. Brake pedal height should not change. If pedal goes slowly downward, a vacuum leak exists in power brake system. Inspect brake vacuum check valve for proper operation. If check valve is okay, replace power brake unit.