Bore End Seal Leak Test

REMOVAL
1. Apply service brake pedal several times to exhaust all vacuum in the system.
2. Remove nut retaining cowl top inner panel tube to brake master cylinder.
3. Disconnect cowl top inner panel tube from cowl and remove.
4. Disconnect brake fluid level warning switch connector, if necessary.
5. Remove two nuts retaining brake master cylinder to power brake booster assembly.
6. Slide brake master cylinder forward.

INSPECTION
^ Inspect end of master cylinder bore for signs of excessive leaking. Some fluid is normal due to the wiping action of the seal.
^ Inspect inside booster for presence of brake fluid. A plastic tie strap can be inserted through push-rod opening or through booster check valve opening and into bottom of booster and checked for fluid.
^ If excessive fluid is found, master cylinder will need to be removed and overhauled and booster Should be replaced if booster is contaminated with a large quantity of fluid. Refer to Master cylinder - Service and Repair. Overhaul

INSTALLATION
1. Position brake master cylinder on studs on power brake booster assembly.
2. Install retaining nuts. Tighten to 26-39 Nm (20-28 ft.lbs).
3. Connect cowl top inner panel tube to cowl.
4. Install nut retaining cowl top inner panel tube to brake master cylinder and tighten to 21-29 Nm (16-21 ft.lbs).
5. Connect brake fluid level warning switch connector, if it was disconnected.