Question about Ford E-350

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1992 ford f350. Peddle worked fine. Then replaced pads, rotors, calipers. Bleed all lines. Now peddle goes to the floor

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  • Ford Master
  • 4,369 Answers

You have air trapeed in the system, probably in the calipers. Try gravity bleed first. If not better, then have a shop use vacuum to refill after sucking down the system.

Posted on Mar 28, 2011

  • gerry bissi Mar 29, 2011

    Hydraulic System Bleeding


    NOTE: When any part of the hydraulic system has been disconnected for repair or replacement, air may get into the lines and cause spongy brake pedal action. This requires the bleeding of the hydraulic system after it has been properly connected so all air is expelled from the brake cylinders and lines. The hydraulic system can be bled manually or with pressure bleeding equipment Rotunda Brake Bleeder 104-00064 or equivalent.

    Brake Master Cylinder Bleeding, Bench

    Support the brake master cylinder body in a vise, and fill both fluid brake master cylinder reservoirs with Ford High-Performance DOT 3 Brake Fluid C6AZ-19542-AA or -BA or equivalent DOT 3 fluid meeting Ford specification ESA-M6C25-A.

    Install plugs in the front and rear brake outlet ports. Bleed the front brake system first.

    Loosen the plug in the front brake outlet port. Depress the primary piston slowly to force the air out of the brake master cylinder (2140).

    Tighten plug while piston is depressed or air will enter the brake master cylinder.

    Repeat this procedure until air ceases to exit at the outlet port.

    Repeat Steps 3, 4 and 5, for the rear brake outlet port with the front brake outlet plugged.

    Tighten the plugs and try to depress the piston. The piston will not depress if all air bubbles are out of the brake system.

    Install the brake master cylinder filler cap (2162).

    Install the brake master cylinder in the vehicle and perform Pressure Bleeding procedure in this section.


    Brake Master Cylinder Bleeding, On-Vehicle

    When a brake master cylinder has been installed, or the brake system emptied or partially emptied, fluid may not flow from the wheel cylinder bleeder screws during normal bleeding. It may be necessary to prime the brake master cylinder using the following procedure.

    Use a tubing wrench to remove the front brake tube (2264) and the brake master cylinder outlet rear tube from the brake master cylinder.

    Install short brake tubes in the brake master cylinder and position them so that they curve into the brake master cylinder reservoir, and the ends of the tubes are submerged in brake fluid.

    Fill the brake master cylinder reservoir with Brake Fluid

    Have an assistant pump the brakes until clear, bubble-free fluid flows from both brake tubes.

    Remove the short brake tubes and reinstall the front brake tube and brake master cylinder outlet rear tube (2B253) on the brake master cylinder.

    Bleed each brake tube at the brake master cylinder using the following procedure:

    Have an assistant pump the brake pedal (2455) 10 times and then hold firm pressure on the brake pedal.
    Loosen the rearmost brake tube fittings with a tubing wrench until a stream of brake fluid comes out. Have an assistant maintain pressure on the brake pedal until the brake tube fitting is tightened again.
    Repeat this operation until clear, bubble-free fluid comes out from around the tube fitting.

    Refill the brake master cylinder reservoir as necessary.
    Repeat this bleeding operation at the front brake tube fittings.

    System Gravity Bleeding

    If any of the brake tubes, disc brake calipers (2B120), or rear wheel cylinders (2261) have been removed, it may be helpful to prime the system by gravity bleeding. This should be done after the brake master cylinder is primed and bled.

    Fill the brake master cylinder with new Heavy-Duty Brake Fluid
    Loosen both of the wheel cylinder bleeder screws (2208) and leave them open until clear brake fluid flows. Be sure to check the brake master cylinder reservoir (2K478) fluid level often and do not let it run dry.

    Tighten the wheel cylinder bleeder screws to 7-9 Nm (62-80 lb-in).

    One at a time, loosen the caliper bleeder screws. Leave the bleeder screws open until clear fluid flows. Check the fluid level often in the brake master cylinder reservoir and do not let it run dry.

    Tighten the caliper bleeder screws to 17-24 Nm (13-18 lb-ft).

    After the brake system has been primed, bleed the brake system at each wheel (1007).


    Manual Bleeding

    Dual Brake System Hydraulic Brake Master Cylinder


    CAUTION: DO NOT allow the brake master cylinder reservoir to run dry during the bleeding operation. Keep the brake master cylinder reservoir filled with the specified brake fluid. Never reuse the brake fluid that has been drained from the hydraulic system.

    NOTE: Bleed the primary and secondary hydraulic brake systems separately.



    Bleed one brake cylinder at a time.
    On F-150, F-250, F-350 and Bronco vehicles, start the bleeding at the RH rear wheel cylinder and then at the LH rear wheel cylinder. After completing, proceed to the bleeder valve on the rear anti-lock brake system (RABS) valve. Then proceed to bleed the front brakes, starting with the right front brake, and finish bleeding on the left front brake.
    On F-Super Duty vehicles, start the bleeding at the right rear brake, then the left rear brake. After completing, proceed to bleed the right front brake and then the left front brake.
    Keep the brake master cylinder reservoir filled with the specified Ford High Performance DOT 3 Brake Fluid C6AZ-19542-AA or equivalent DOT 3 fluid meeting Ford specification ESA-M6C25-A. Never use brake fluid that has been drained from the system.
    If there is reason to believe air has entered the brake master cylinder, bleed as follows:

    On the brake master cylinder reservoir, loosen the master cylinder-to-hydraulic line fittings.

    Wrap a shop cloth around the tubing below the fitting to absorb escaping brake fluid.

    Push the brake pedal down slowly to the floor of the cab. This will force air trapped in the brake master cylinder to escape at the fitting.

    Hold the brake pedal down and tighten the fitting. Release the brake pedal. Do not release the brake pedal until the fitting is tightened or air will re-enter the brake master cylinder.

    Repeat this procedure until air ceases to escape at the fitting.

    Place a box wrench on the RH wheel cylinder bleeder screw. Attach a rubber drain tube to the wheel cylinder bleeder screw making sure the end of the tube fits snugly around the wheel cylinder bleeder screw.

    Submerge the free end of the tube in a container partially filled with clean brake fluid. Loosen the wheel cylinder bleeder screw approximately three-quarters of a turn.

    Slowly push the brake pedal all the way down. Close the wheel cylinder bleeder screw, and return the brake pedal to the fully-released position. Repeat this operation until air bubbles no longer appear at the submerged end of the bleeder tube.

    When the fluid is completely free of air bubbles, close the wheel cylinder bleeder screw and remove the bleeder tube.

    Repeat this procedure at the LH rear wheel cylinder. Refill the brake master cylinder reservoir as needed.

    CAUTION: Do not reuse brake fluid that has been bled from the system.

    Place a box wrench on the bleeder fitting on the rear anti-lock brake system (RABS) valve. Attach a rubber drain tube to the bleeder fitting making sure the end of the tube fits snugly around the bleeder fitting.

    Submerge the free end of the tube in a container partially filled with clean brake fluid. Loosen the bleeder fitting approximately three-quarters of a turn.






    Slowly press the brake pedal all the way down. Close the bleeder fitting, and return the brake pedal to the fully released position. Repeat this operation until air bubbles no longer appear at the submerged end of the bleeder tube.

    When the fluid is completely free of air bubbles, close the bleeder fitting and remove the bleeder tube.

    Bleed the front brakes starting with the right front brake and then the left front brake as described in Steps 6-10 of this procedure.

    When the bleeding operation is complete, fill the brake master cylinder reservoir to the maximum level line.


    Pressure Bleeding


    NOTE: Bleed the longest lines first. Be sure the bleeder tank contains enough specified brake fluid, Ford High-Performance DOT 3 Brake Fluid C6AZ-19542-AA or -BA or DOT 3 equivalent meeting Ford specification ESA-M6C25-A to complete the bleeding operation. Charge the tank with approximately 69-206 kPa (10-30 psi) of air pressure. Never exceed 345 kPa (50 psi) of pressure. Never re-use brake fluid that has been drained from the hydraulic system.



    Clean all dirt from the brake master cylinder filler cap.

    Remove brake master cylinder filler cap and fill the brake master cylinder reservoir with the specified brake fluid.

    NOTE: Master cylinder pressure bleeder adapter tools are available from various manufacturers of pressure bleeding equipment. Follow the instructions of the manufacturer when installing the adapter.



    Install pressure bleeder adapter Rotunda Brake Bleeder 104-00064 or equivalent to the brake master cylinder reservoir, and attach bleeder tank hose to fitting on adapter.

    Place a 3/8-inch box wrench on RH wheel cylinder bleeder screw. Attach a bleeder tube snugly around wheel cylinder bleeder screw.

    Open valve on bleeder tank to admit pressurized brake fluid to the brake master cylinder reservoir.

    Submerge free end of tube in a partially filled container with clean brake fluid and loosen wheel cylinder bleeder screw.






    When air bubbles no longer appear in the fluid at the submerged end of the bleeder tube, close the wheel cylinder bleeder screw and remove tube.

    Continue bleeding rest of the system going in order from the LH rear wheel cylinder (2262), then proceed to the front RH disc brake caliper, ending with front LH front disc brake caliper (2B121).
    When the bleeding operation is completed, close bleeder tank valve and remove the tank hose from adapter fitting.

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