Auto Repairing 1998 Ford Windstar Hydraulic System Bleeding
Pls any part of the hydraulic systems has been Disconnected The for service, air may enter systems and cause spongy pedal action. Bleed the hydraulic systems after it has been opened to the make sure that all water is Expelled. Due to the diagonal braking system on this vehicle (front LH and RH rear on one circuit LH and RH front and rear on the other), bleeding the front brakesfirst Allows for a shorter flow path for water entrapped in the replacement the valve. Once the front the brakes have been thoroughly bled, the only remaining volume of water to be eliminated in the upper section of the ABS the valve is the water in the short sections of the rear brake tubes are not accessible by the front the brakes via the ABS the valve.
Brake Master Cylinder Bleeding When a new brake master cylinder (2140) has been installed or the brake system emptied or partially emptied, fluid may not flow from the bleeder screws during normal bleeding. It may be necessary to prime the system using the following procedure: 1. Use a tubing wrench to remove the brake tubes from the master cylinder. 2. Install short brake tubes in the brake master cylinder and position them so that they point back into the reservoir and the ends of the pipes are submerged in brake fluid. 3. Fill the reservoir with new Ford High Performance DOT-3 Motor Vehicle Brake Fluid C6AZ-19542-AA or DOT-3 equivalent meeting Ford specification ESA-M6C25-A. 4. Cover the reservoir with a clean shop towel. 5. CAUTION: Brake fluid is harmful to painted and plastic surfaces. If brake fluid is spilled onto a painted or plastic surface, immediately wash it with water.
Pump the brakes until clear, bubble-free fluid comes out of both brake tubes. 6. Remove the short brake tubes and reinstall the ones from the vehicle. 7. Bleed each brake tube at the brake master cylinder using the following procedure: a. Have an assistant pump the brake pedal 10 times and then hold firm pressure on the pedal. b. Loosen the front brake line fitting with a tubing wrench until a stream of brake fluid comes out. Have your assistant maintain pressure on the brake pedal until the brake line fitting is tightened again. c. Repeat this operation until clear, bubble-free fluid comes out from around the tubing fitting. d. Repeat this bleeding operation at the rear brake line fitting. 8. If any of the brake lines or calipers have been removed, it may be helpful to prime the system by gravity bleeding it. This should be done after the brake master cylinder is primed and bled. To prime the brake system: a. Fill the brake master cylinder reservoir (2K478) with clean Ford High Performance DOT-3 Motor Vehicle Brake Fluid C6AZ-19542-AA or equivalent meeting Ford specification ESA-M6C25-A. b. Loosen both rear caliper bleeder screws and leave them open until clear brake fluid flows out. Be sure to check the reservoir fluid level often and not let it run dry. c. Tighten the bleeder screws. d. One at a time, loosen the front caliper bleeder screws. Leave the bleeder screws open until clear fluid flows out. Be sure to check the reservoir level often and not let it run dry. e. Tighten the bleeder screws to 7-9 Nm (61-87 lb-in). 9. After the brake master cylinder has been primed, the lines bled at thebrake master cylinder, and the brake system primed, normal brake system bleeding can resume at each wheel.
Manual Bleeding 1. NOTE: During hydraulic system bleeding, maintain sufficient brake fluid level in the brake master cylinderreservoir to prevent air from entering the system. Clean all dirt from brake master cylinder filler cap (2162). 2. If brake master cylinder is known or suspected to have air in bore, it must be bled before any of the wheel cylinders or calipers. To bleed brake master cylinder, loosen front outlet fitting approximately three-quarter turn. 3. Have assistant push brake pedal (2455) down slowly through full travel. Close outlet fitting, then return pedal slowly to full released position. Wait five seconds; then repeat operation until air bubbles cease to appear at the outlet fitting. 4. Loosen rear outlet fitting approximately three-quarter turn. 5. Repeat Step 3. 6. To continue to bleed brake system, remove rubber dust cap from bleeder screw. Place suitable box wrench on bleeder and attach rubber drain tube screw. The end of tube should fit snugly around bleeder screw. 7. Submerge free end of tube in container partially filled with clean brake fluid and loosen bleeder screw approximately three-quarter turn. 8. Have assistant push brake pedal down slowly through full travel. Close bleeder screw; then return the brakepedal to full release position. Wait five seconds; then repeat this operation until air bubbles cease to appear at submerged end of bleeder tube. 9. When fluid is completely free of air bubbles, secure bleeder screw and remove bleeder tube. Install rubber dust cap on bleeder screw. 10. Repeat this process on opposite diagonal system. Refill brake master cylinder reservoir as necessary and install the brake master cylinder filler cap. When bleeding operation is completed, fluid level should be filled up to or within 3.0 mm (0.125 inch) of the MAX line on the brake master cylinder reservoir. 11. Always make sure disc brake pistons are returned to their normal positions by applying brake pedal several times until normal pedal travel is established. 12. Check pedal feel. If the brake pedal feels “spongy,” repeat bleed procedure.
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