2001 Ford ZX2 Brake Service (ONLINE REPAIR MANUALS)

Vacuum Assist Diaphragm Type

The vacuum assist diaphragm assembly multiplies the force exerted on the master cylinder piston in order to increase the hydraulic pressure delivered to the wheel cylinders while decreasing the effort necessary to obtain acceptable stopping performance.

Vacuum assist units get their energy by opposing engine vacuum to atmospheric pressure. A piston, cylinder and flexible diaphragm utilize this energy to provide brake assistance. The diaphragm is balanced with engine vacuum until the brake pedal is depressed, allowing atmospheric pressure to unbalance the u...

• Inspect components for damage and unusual wear. Replace as required.
• Inspect wheel cylinders. Boots which are torn, cut, or heat damaged indicate need for wheel cylinder replacement. Fluid spilling from boot center hole, or wetness around wheel cylinder ends indicates cup leakage and need for wheel cylinder replacement. A small amount of fluid is always present and is considered normal, acting as lubricant for cylinder pistons.
• Inspect backing plate ...

If caliper does not require servicing, do not disconnect brake hose or remove caliper from vehicle. Position caliper aside with wire or tie straps to avoid damaging caliper or hose.

If excessive force must be used to remove the rotor, then it should be inspected for lateral runout before installation.

Removal

• On models equipped with air suspension, turn service switch Off.
• On all models, raise and support vehicle, then remove wheel and tire assembly. Use care to avoid damage or interference with caliper bleeder screw fitting and brake rotor shield.
• Remove caliper anchor bracket bol...

Brake Roughness

If roughness or vibration is encountered during highway operation or if pedal pumping is experienced at low speeds, the disc may have excessive thickness variation. Measure the disc at 12 points with a micrometer at a radius approximately one inch from the edge of the disc. If thickness measurements vary by more than .0005 inch, replace the rotor.

Excessive later...

Replacement

On models with anti-lock brakes, the brake booster system must be depressurized before disconnecting any hydraulic lines or fittings. Depressurize the system by pumping the brake pedal a minimum of 25 times with the ignition in the Off position.

Continental, Cougar, Crown Victoria, Grand Marquis, LS, Marauder, Mustang (Except Cobra), Sable, Taurus, Thunderbird & Town Car

Before removing calipers, mark lefthand and righthand calipers so they can be installed in the same position.

• On models equipped with air suspension, turn air suspension service switch to Off position.
• On...

Pressure bleeding is recommended for all hydraulic disc brake systems.

Do not use brake fluid drained from the hydraulic system when bleeding the brakes. Ensure disc brake pistons are returned to their normal positions and the shoe and lining assemblies are properly seated. Before driving the vehicle, inspect the brake operation.

Do not shake the pressure bleeder tank while air is being added or after it has been pressurized. This will prevent air from the tank getting into the lines. Set the tank in the required location, then bring the air hose to the tank. Do not move the ta...