See Figures 1 and 2
On non-ABS vehicles, these parts are installed in the master cylinder body. On ABS equipped vehicles, the proportioning valve is usually located new the fuel filter under the car on the right side.
If equipped with Anti-lock Brake System (ABS), ensure that the hydraulic accumulator is fully depressurized before disconnecting any hydraulic lines, hoses or fittings.
- If equipped with ABS, raise and safely support the vehicle.
- Disconnect and plug the brake lines from the proportioning valves.
- Remove the proportioner valve(s) and O-ring assembly.
- Lubricate new O-rings and the external proportioner valve threads with clean brake fluid. Install new O-rings on the proportioner valve(s).
- On non-ABS vehicles, install the new valve(s) into the master cylinder and tighten to 24 ft. lbs. (31 Nm).
- On vehicles with ABS, install the new valve(s) to the brake line.
- Connect the brake pipes to the proportioning valve(s), then tighten to 11 ft. lbs. (5 Nm).
- If raised, carefully lower the vehicle.
- Refill the master cylinder and bleed the brake system.
- Connect the negative battery cable.
See Figures 3, 4 and 5
- Disconnect the negative battery cable.
Remove the master cylinder fluid reservoir, as follows:
- Remove the master cylinder from the vehicle, and clamp the flange of the master cylinder body in a suitable vise. Clamp only on the flange, NOT on the master cylinder body.
- Use a 1 / 8 in. punch to carefully drive out the spring pins, being careful not to damage the when driving out the pins.
- Remove the reservoir by pulling straight up, away from the cylinder body.
- Remove the O-rings from the grooves in the reservoir. Discard the O-rings and replace with new ones during installation.
- Remove the proportioner valve cap, then remove the O-rings and springs.
- Remove the proportioner valve pistons. Use needle nose pliers to remove the pistons, but be careful not the scratch or damage the piston stems.
- Remove the proportioner valve seals from the pistons.
- Inspect the pistons for corrosion or deformation and replace if found.
- Lubricate new O-rings and proportioner valve seals with the silicone grease in the repair kit. Also, lubricate the stems of the proportioner valve pistons.
- Install new seals on the proportioner valve pistons with the seal lips facing upward toward the cap assembly.
- Install the proportioner valve pistons and seals into the master cylinder body.
- Place the springs in the master cylinder body.
- Install new O-rings in the groove in the proportioning valve cap assemblies.
- Install the proportioning valve caps in the master cylinder body, then tighten the caps to 20 ft. lbs. (27 Nm).
Install the master cylinder fluid reservoir, as follows:
- Lubricate new O-rings and reservoir bayonets with clean brake fluid, then install the O-rings in the grooves in the reservoir. Make sure the O-rings are properly seated.
- Install the reservoir to the master cylinder body by pressing it straight down by hand into the body.
- Drive the spring pins in to secure the reservoir, being careful not to damage the reservoir or cylinder body.
- Remove the master cylinder from the vise, then install in the vehicle.
See Figures 6 and 7
- Raise and safely support the vehicle.
- Clean the proportioning valve and brake pipe connections with denatured alcohol or equivalent to be sure no contaminants enter the brake system during servicing.
- Use a flare nut wrench to disconnect the brake lines from the proportioning valve, then remove the proportioning valve from the vehicle.
- Install the proportioner valve in the vehicle, then connect the brake line, using a flare nut wrench. Tighten the proportioner valve fittings to 11 ft. lbs. (5 Nm).
- Carefully lower the vehicle.