Brake System Bleeding Ford LTD Crown Victoria I

DESCRIPTION

Hydraulic system bleeding is necessary any time air has been introduced into system. Bleed brakes at all 4 wheels if master cylinder lines have been disconnected or master cylinder has run dry. Bleeding can be accomplished by using pressure bleeding equipment or by manually pumping brake pedal and using a clear bleeder hose.

SERVICING METERING VALVE

1. On disc brake equipped vehicles, the metering section of combination valve must be held open before pressure bleeding.
2. Hold metering valve open while pressure bleeding front brakes. To loosen front mounting bolt and install pressure bleeding tool on combination valve, valve stem should be fully extended or depressed.

Note. Never reintroduce brake fluid that has been drained from hydraulic brake system or that has been allowed to stand in an open container for an extended period of time. Also, do not use fluid that contains a petroleum base. Petroleum based fluids will cause swelling and distortion of rubber parts in hydraulic system.

BENCH BLEEDING MASTER CYLINDER

Note. Bleed tubes must have a residual pressure check valve installed to keep tubes from siphoning brake fluid.

1. Clamp master cylinder in vise by mounting flange. Install bleed tubes in outlet ports. (Scheme 1) Fill reservoirs with clean brake fluid so that bleed tubes are below brake fluid level.
2. Slowly compress and release piston assemblies until bubbles cease to appear in brake fluid. Remove tubes and plug master cylinder outlets to keep fluid from draining.

Scheme 1

MANUAL BLEEDING

Note. Ensure that fluid level in master cylinder is adequate at all times during bleeding procedure.

1. Fill master cylinder with clean brake fluid. Install bleeder hose to wheel assembly being serviced. Submerge other end of hose in clean glass jar partially filled with clean brake fluid.
2. Depress brake pedal slowly through its full travel and hold. Open bleed screw 3/4-1 turn. Close bleed screw. Release brake pedal. Repeat procedure until brake fluid shows no signs of air bubbles.

PRESSURE BLEEDING

1. To prevent dirt from falling into reservoir, clean master cylinder and cover/diaphragm assembly, With pressure tank at least 1/3 full, connect to master cylinder using adapters.
2. Install bleeder hose to wheel assembly being serviced. Submerge other end of hose in clean glass jar partially filled with clean brake fluid.
3. Open release valve on pressure bleeder. Open bleed screw 3/4-1 turn. Close bleed screw when brake fluid is clear and free of bubbles. Bleed remaining wheel assemblies in sequence and in same manner. Remove pressure bleeding tool.

BLEEDING PRESSURES

BLEEDING PRESSURES

BLEEDING SEQUENCE

If vehicle is equipped with power brakes, exhaust vacuum reserve from power unit by depressing brake pedal several times. Bleed master cylinder before bleeding wheel assemblies. Bleed wheel cylinders or calipers in the correct sequence.

BLEEDING SEQUENCE