Vacuum Brake Booster: Service and Repair
Vacuum Brake Booster Replacement (w/RPO LSJ)
Caution: Refer to Brake Fluid Irritant Caution.
Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice.
Removal Procedure
1. Disconnect the negative battery cable.
2. Remove the cover from the underhood electrical center.
3. Pull back on the connector position assurance (CPA) tab of the electrical connector, then disconnect the connector from the brake fluid level sensor.
4. Release the forward lamp harness retainer from the ABS modulator bracket, to allow the underhood electrical center to be repositioned adequately.
5. Remove the underhood electrical center bracket from the vehicle and reposition the electrical center (1) to access the brake master cylinder and brake booster.
6. Disconnect the electrical connector from the evaporative emission (EVAP) purge solenoid, to allow the electrical center to be repositioned adequately.
7. Release the wiring harness (2) retainers (1) above the brake booster, to allow the electrical center to be repositioned adequately.
8. Release the wiring harness retainer (1) from the side of the LH strut tower. Reposition the harness upward to allow clearance for booster removal.
9. Position the underhood electrical center (1) further toward the LH hood hinge, and secure the center in place.
10. Remove the brake master cylinder auxiliary reservoir mounting bolts.
11. Disconnect the quick-connect fitting on the auxiliary reservoir clutch hose from the clutch master cylinder.
12. Plug the reservoir clutch hose end, and cap the nipple on the clutch master cylinder to prevent fluid loss and contamination.
13. Release the brake master cylinder pipes from the 6-position pipe clip along the frame rail.
14. Disconnect the brake pipes (1) from the master cylinder.
15. Cap the open brake pipe fitting ends, and plug the ports on the master cylinder to prevent brake fluid loss and contamination.
16. Position the master cylinder pipes rearward and outboard, behind the wiring harness along the strut tower.
17. Remove the master cylinder mounting nuts.
18. Remove the master cylinder and the auxiliary reservoir, as an assembly, from the vehicle.
19. Inspect the master cylinder-to-vacuum brake booster seal (1) for damage. Replace the seal (1) if necessary.
20. Disconnect the vacuum check valve (2) from the brake booster and position aside the check valve (2) and vacuum hose (3).
21. Disconnect the EVAP purge hose from the purge solenoid. Reposition the purge hose toward the engine.
22. Loosen the brake booster mounting nuts.
23. Remove the retaining clip (1) and washer (2) from the brake pedal.
24. Release the brake booster pushrod (3) from the brake pedal.
25. Remove the brake booster mounting nuts.
26. Press the coolant surge tank outlet hose down while removing the booster.
Important: Use care to ensure that no oil or contaminants enter the vacuum brake booster through the master cylinder opening. Cover the opening on the booster, if possible.
27. Remove the brake booster and the booster mounting gasket from the vehicle.
28. Inspect the mounting gasket for damage and replace if necessary.
Installation Procedure
Notice: Internal components of this booster are not serviceable. The housing must not be unstaked and separated. Separating the housing will cause permanent deformation, preventing the booster from holding proper volume.
1. Install the mounting gasket to the vacuum brake booster.
2. Press the coolant surge tank outlet hose down while installing the brake booster.
3. Install the brake booster to the dash panel.
4. Loosely install the brake booster mounting nuts.
5. Apply a thin coating of lithium grease to the pushrod pin on the brake pedal.
6. Connect the brake booster pushrod (3) to the brake pedal.
7. Install the washer (2) and retaining clip (1) to the brake pedal.
Notice: Refer to Fastener Notice.
8. Tighten the vacuum brake booster mounting nuts.
Tighten the nuts to 25 N.m (18 lb ft).
9. Connect the EVAP purge hose to the purge solenoid.
Important: A small amount of denatured alcohol can be used as an assembly aid when installing the vacuum check valve. Do NOT use soap.
10. Connect the vacuum check valve (2) with hose (3) to the brake booster.
11. Check to ensure that the master cylinder-to-vacuum brake booster seal (1) is properly seated into the recessed groove on the master cylinder.
12. Install the master cylinder and the auxiliary reservoir, as an assembly, to the vacuum brake booster.
13. Install the brake master cylinder mounting nuts.
Tighten the nuts to 20 N.m (15 lb ft).
14. Install the brake master cylinder auxiliary reservoir mounting bolts.
Tighten the bolts to 10 N.m (89 lb in).
15. Remove the plug from the reservoir clutch hose end, and the cap from the nipple on the clutch master cylinder.
16. Connect the quick-connect fitting on the reservoir clutch hose to the clutch master cylinder. Ensure that the hose is fully seated to the master cylinder.
17. Secure the master cylinder pipes to the 6-position pipe clip along the frame rail.
18. Position the master cylinder pipes to the master cylinder ports.
19. Remove the caps from the brake pipe ends, and the plugs from the ports on the master cylinder.
20. Connect the brake pipe fittings (1) at the master cylinder.
Tighten the fittings to 18 N.m (13 lb ft).
21. Lower the underhood electrical center toward the installed position, then secure the wiring harness retainer (1) to the side of the LH strut tower.
22. Install the wiring harness (2) to the retainers (1) above the brake booster, and secure the retainers (1).
23. Connect the electrical connector to the EVAP purge solenoid.
24. Install the underhood electrical center bracket to the vehicle and install the electrical center (1) into position on the bracket.
25. Secure the forward lamp harness retainer to the ABS modulator bracket.
26. Connect the electrical connector to the brake fluid level sensor, then press forward on the CPA tab of the connector to secure.
27. Install the cover to the underhood electrical center.
28. Connect the negative battery cable.
29. Bleed the hydraulic brake system.