Vacuum Brake Booster: Service and Repair

Vacuum Brake Booster Replacement

Removal Procedure




1. Remove the master cylinder. Refer to Master Cylinder Replacement Removal and Replacement.




2. Remove the shaft and the rubber O-ring.




3. Remove the clip on the vacuum hose connection on the booster.
4. Disconnect the brake stop lamp switch. Refer to Stop Lamp Switch Replacement Service and Repair.
5. Remove the brake pedal spring.
6. Disconnect the clip and the pushrod pin from the pedal bracket assembly.




7. Remove the booster mounting nuts from the studs protruding from the dash panel and remove the booster.
8. Remove the rubber boot.




9. Holding the hex nut, twist off the pushrod clevis.
10. Remove the hex nut from the pushrod.

Installation Procedure




1. Check the pushrod and the pushrod clevis for damage and proper fit.

Notice: Refer to Fastener Notice Fastener Notice.

2. Install the hex nut and the pushrod clevis on the booster shaft.

Tighten the booster hex nut and the pushrod clevis to 18 Nm (13 lb ft).




3. Measure the distance from the booster to the center of the fork pin bore.

This measurement should be 120 mm (4.7 in).

4. Install the rubber boot on the booster.




5. Install the booster and the mounting nuts to the dash panel.

Tighten the booster-to-dash panel nuts to 22 Nm (16 lb ft).




6. Attach the shaft and the rubber O-ring.
7. Connect the master cylinder to the booster. Refer to Master Cylinder Replacement Removal and Replacement.
8. Connect the brake line fittings to the hydraulic modulator, if applicable.

* Tighten the brake line fittings to 16 Nm (12 lb ft).
* Tighten the master cylinder attaching nuts to 24 Nm (18 lb ft).




9. Install the new vacuum hose to the booster. Refer to Vacuum Brake Booster Check Valve and/or Hose Replacement Service and Repair.
10. Install the hose clamps on the vacuum hose, and snap the vacuum hose in the revolving clip.
11. Install the pushrod pin to the brake pedal bracket assembly and connect the clip and the spring.
12. Install the stop lamp switch. Refer to Stop Lamp Switch Replacement Service and Repair.