System Operation Test

1. With the engine OFF, pump the brake pedal until the vacuum supply is entirely gone.
2. Place your foot on the brake pedal and apply steady pressure. Maintain steady pressure on the brake pedal.
3. Start the engine and let it idle. If the system is operating correctly, the brake pedal should fall to the floor.

NOTE: Power brake systems may be tested for hydraulic leaks just as ordinary systems are tested.

WARNING
Never use brake fluid from an open container. Brake fluid is hydroscopic, and will absorb moisture that will compromise the efficiency of the fluid. Clean, high quality brake fluid is essential to the safe and proper operation of the brake system. You should always buy brake fluid recommended for your vehicle and brake system. Never mix DOT grade brake fluid with Silicon Brake Fluid; the combination is tantamount to adding air to the brake lines, causing weak and ineffective braking and an expensive procedure to clean, flush and replenish the brake system. If the brake fluid becomes contaminated, drain and flush the system, then refill the master cylinder with new fluid. Never reuse any brake fluid. Discard any brake fluid that is removed from the system. Also, vehicles equipped with ABS (Antilock Brake Systems) must be professionally bled using a pressure bleeder or a gravity bleed procedure. Refer to a qualified repair center for service.