Brake Booster Operation Check

1. Check the hydraulic brake system for leaks or low fluid.
2. With transaxle in PARK, stop engine and apply parking brake. Apply the brake pedal several times to exhaust all vacuum in the system.
3. With the engine turned off and all vacuum in the system exhausted, apply the brake pedal, and hold it down. Start the engine. If the vacuum system is operating, the brake pedal will tend to move downward under constant foot pressure. If no motion is felt, the vacuum booster system is not functioning.