Braking Sensor/Switch: Service and Repair
SENSOR-TRAVELREMOVAL
CAUTION: Vacuum in power brake booster must be pumped down (removed) before removing master cylinder from power brake booster. This is necessary to prevent power brake booster from sucking in any contamination as master cylinder is removed. This can be done simply by pumping brake pedal, with vehicle's engine not running, until a firm feeling brake pedal is achieved.
1. With engine not running, pump brake pedal until a firm pedal is achieved (4-5 strokes).
2. Disconnect and isolate battery negative cable (2) from battery post.
3. Disconnect wiring harness (6) connector at pedal travel sensor (7) on power brake booster (3).
4. Using a small screwdriver, remove sensor retaining ring (1).
5. Pull travel sensor straight out of booster.
INSTALLATION
CAUTION: Before installing new pedal travel sensor, replace O-ring (2) inside booster opening. Sparingly lubricate NEW O-ring with brake fluid. Use care not to lose O-ring inside booster.
1. Install NEW sensor retaining ring (1) in groove on booster.
2. Align sensor keyway with notch in top of sensor mount on booster housing, then install pedal travel sensor (2). The sensor will snap into place past the retaining ring (1).
3. Connect wiring harness (6) connector to pedal travel sensor (7).
4. Connect battery negative cable (2) to battery post. It is important that this is performed properly.
6. Start vehicle and check for vacuum leaks around sensor. Correct as necessary