Brake Booster

Brake Booster-Operation Check
1. Inspect all vacuum hoses and connections. All unused vacuum connectors must be capped Hoses and their connections must be correctly secured and in good condition with no holes, cracks, or collapsed areas.
2. Check the brake hydraulic system for leaks or insufficient brake fluid. Repair as necessary.
3. With the engine off, place the transaxle in PARK (A/T) or NEUTRAL (M/T) and apply the parking brake.

4. NOTE: If the power brake booster is noisy when the brakes are applied, a new component must be installed.

Press the brake pedal several times to exhaust all of the vacuum from the system.
5. Press and hold the brake pedal.
6. Start the engine. If the vacuum system is operating, the brake pedal will move downward under constant foot pressure. If no movement occurs, the power brake booster system is not functioning.
7. Remove the vacuum booster hose from the power brake booster.
8. Place the transaxle in PARK (A/T) or NEUTRAL (M/T) and apply the parking brake. Start the engine. Manifold vacuum should be available from the vacuum booster hose. If manifold vacuum is not available, inspect all of the hoses and hose connections. Repair as necessary.
9. Reconnect the vacuum booster hose and run the engine at fast idle for 10 seconds.
10. Stop the engine and let the vehicle stand for 10 minutes.
11. Apply the brake pedal with approximately 89 Nm (20 ft. lbs.) of force. The brake pedal feel should be the same as normal power assisted brake operation for at least one application. If the brake pedal feel is normal, then the power brake booster is OK. If the brake pedal feels hard, continue with the test.
12. Remove the vacuum booster hose from the power brake booster. Apply 57.3 kPa (17 in-Hg) of vacuum to the vacuum booster hose. If the vacuum does not leak off after l0 minutes, install a new power brake booster. If the Vacuum does leak off, install a new check valve and/or new vacuum booster hose.