The hydraulic booster uses fluid pressure from the power steering system. A malfunctioning power steering system can affect the hydraulic booster. A malfunctioning booster can affect the steering system. Before beginning extensive testing perform the following procedure:

1. Check all power steering and brake pipe connections for leaks and restrictions.

Important: Power steering fluid and brake fluid cannot be mixed. If brake seals contact power steering fluid or steering seals contact brake fluid, seal damage will result.

2. Ensure that the master cylinder and power steering pump reservoir are properly filled. If the fluids contain air, refer to Hydraulic Brake System Bleeding and Power Steering System Bleeding .
3. Check the power steering pump belt for wear and improper tension. Refer to Drive Belt Replacement .
4. Check the power steering pump pressure. Refer to Power Steering System Test Procedure .

After performing the following steps, the pedal should fall away, and then push back against your foot.

1. With the ignition OFF, apply and release the brake pedal several times to empty the accumulator.
2. Apply and hold the brake pedal with 180 N (40 lb) of force.
3. Start the engine.