REMOVAL & INSTALLATION
See Figure 1
Be sure to clean the area where the master cylinder is mounted, before beginning removal.
- Disconnect and cap or plug hydraulic lines to prevent fluid contamination or loss.
- Remove the attaching nuts.
- If the combination valve bracket is mounted over the master cylinder on the power brake booster studs, pull the bracket from the studs and reposition it aside.
- Remove the master cylinder.
- Install the master cylinder on the power booster studs.
- If applicable, install the combination valve bracket on the power booster studs.
- Install the attaching nuts and tighten to 20 ft. lbs. (27 Nm) for all except 1991 vehicles or tighten to 15 ft. lbs. (21 Nm) for 1991 vehicles only.
- Unplug hydraulic lines, attach to the master cylinder and tighten to 24 ft. lbs. (32 Nm).
- Fill with approved brake fluid and bleed system.
See Figures 2, 3 and 4
This is a tedious, time-consuming job. You can save yourself a lot of trouble by buying a rebuilt master cylinder from your dealer or parts supply house. The small difference in price between a rebuilding kit and a rebuilt part usually makes it more economical, in terms of time and work, to buy the rebuilt part.
- Remove the reservoir cover and diaphragm. Discard any brake fluid in the reservoir.
- Inspect the reservoir cover and diaphragm for cuts, cracks, or deformation. Replace any defective parts.
- Depress the primary piston and remove the lock ring.
- Direct compressed air into the outlet at the blind end of the bore and plug the other outlet to remove primary and secondary piston.
- Remove the spring retainer and seals from the secondary piston.
- Clamp the master cylinder in a vise. Do not clamp it on the master cylinder body. Using a pry bar, remove the reservoir.
- Do not attempt to remove the quick take-up valve from the body. This valve is not serviced separately.
- Remove the reservoir grommets.
- Inspect the master cylinder bore for corrosion. If corroded, replace the master cylinder. Do not use any abrasive on the bore.
- Reassemble, using new seals and grommets. Lubricate all parts with brake fluid.
- Install the reservoir grommets.
- Install the reservoir.
- Install the spring retainer and seals from the secondary piston.
- Install primary and secondary piston.
- Depress the primary piston and install the lock ring.
- Fill with brake fluid. Install the reservoir cover and diaphragm.
- Bleed brake system.