Overhaul

NOTE:
^ On vehicles equipped with traction control, the brake master cylinder must not be overhauled, because of internal adjustments which require extensive special tools and fixtures.
^ On vehicles without ABS, or with ABS without traction control, the brake master cylinder is serviced as follows.

DISASSEMBLY
If brake master cylinder is to be put into a vise to aid in disassembly mount into vise by flange only to avoid damage to bore or reservoir areas.





1. Clean the outside of the brake master cylinder thoroughly. Remove the brake master cylinder filler cap and gasket. Always discard used brake fluid.
2. Remove stop bolt and pressure control valve by unscrewing from brake master cylinder. The brake master cylinder internals cannot be removed unless the stop bolt and pressure control valve are removed.

Piston Snap Ring:

3. Depress the primary piston and remove snap ring from retaining groove at the open end of the bore.
4. Remove the primary piston and secondary piston assemblies from brake master cylinder. Tap open end of brake master cylinder on bench to remove pistons. If secondary piston does not readily come out, apply air pressure to secondary outlet port to assist removal.


ASSEMBLY
1. Dip replacement piston assemblies in High Performance DOT-3 Motor Vehicle Brake Fluid for lubrication prior to assembly into brake master cylinder. Attempting to assemble piston assemblies with dry seals can ruin them.
2. Install secondary (smaller) piston assembly into bore, spring end first.
3. Install primary piston assembly, spring end first.
4. Depress primary piston and install snap ring.
5. Install pressure control valve into brake master cylinder. Tighten to 13-24 Nm (10-17 ft. lbs.). Install stop bolt and tighten to 1-4 Nm (9-35 inch lbs.).
6. Fill and bleed brake master cylinder. Bleeding
7. Install cap and gasket on brake master cylinder reservoir.
8. Road test vehicle.