For 1990-2009 cars

### Removal Procedure

1. Remove the clip on the vacuum hose connection at the brake booster.
2. Remove the hose from the brake booster.
3. Remove the clip on the vacuum hose connection at the intake manifold.
4. Remove the vacuum hose.

### Installation Procedure

1. Install the vacuum hose to the vacuum hose connection at the intake manifold.
2. Install the vacuum hose clip.
3. Install the vacuum hose to the booster.
4. Install the vacuum hose clip.
5. With the engine OFF, eliminate vacuum in the booster by pumping the brake pedal several times.
6. Maintain moderate pressure on the brake pedal and start the engine.

Observe the operation of the brake pedal.

The brake assist system is functioning properly if the pedal drops slightly because the booster increases the force on the master cylinder pushrod.

If the pedal does not drop, refer to Diagnostic Starting Point - Hydraulic Brakes .