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More Ford Ranger RABS

Q. Hello, I have a 1994 Ford Ranger truck short bed. It has the 4.0 liter V-6, automatic transmission, P/S, P/B , A/C and C/C. The miles are around 72,000. The Brake and ABS light came on after my wife had to brake hard one day. It would come on and go off then it would not go off at all. I checked the brake pads and shoes they were worn down but not into the rivets.

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So I replaced the front pads, rotors and calipers, along with the rear shoes. Bled the system and the lights are still on? One mechanic said I needed to have it put on the scope to have the computer read to find the problem. I don't think that is the case.

The truck has a good brake pedal and stops just fine and their is no other problem that I can see, other then the brake light and ABS light is staying on. Any help here is grateful.

Thanks,
Frederick

A. First thing to do is bleed the brake system according to this procedure. It is important to follow it step by step.

  1. On the brake master cylinder reservoir, loosen the master cylinder-to-hydraulic line fittings.
  2. Wrap a shop cloth around the tubing below the fitting to absorb escaping brake fluid.
  3. Push the brake pedal down slowly to the floor of the cab. This will force air trapped in the brake master cylinder reservoir to escape at the fitting.
  4. Hold the brake pedal down and tighten the fitting. Release the brake pedal. NOTE: Do not release the brake pedal until the fitting is tightened or air will re-enter the brake master cylinder reservoir.
  5. Repeat this procedure until air ceases to escape at the fitting.

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

    1. 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.
    2. 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.
    3. When the fluid is completely free of air bubbles, close the bleeder fitting and remove the bleeder tube.
  2. Place a box wrench on the right brake wheel cylinder. Attach a rubber drain tube to the bleeder fitting making sure the end of the tube fits snugly around the bleeder fitting.
  3. 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.
  4. Slowly push 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.
  5. When the fluid is completely free of air bubbles, close the bleeder fitting and remove the bleeder tube.
  6. Repeat this procedure at the left brake wheel cylinder on the opposite side. Refill the brake master cylinder reservoir after each wheel cylinder is bled.
  7. Bleed the front brakes starting with the right front brake and then the left front brake as described in Steps 7-11 of this procedure.
  8. When the bleeding operation is complete, fill the brake master cylinder to the maximum level line of the brake master cylinder reservoir.

If unequal brake pressure is the cause of the light being on, this will shut it off. This will not rule out a possible bad combination valve.

If the light is still on, you will need to check the parking brake switch to insure it is not stuck closed and that the parking brake is fully released. It is also possible the low fluid sensor in the master cylinder is bad. If you unplug it and with an ohmmeter check the sensor it should read OPEN when the master cylinder is full. If not it is bad and needs to be replaced.

If none of these suggestions turns the light off, then you will need to access the RABS control unit and find out what codes are stored. The procedure is here: Ford Ranger ABS Light. Once we know what the code is, we can go from there.

Additional Information provided courtesy of ALLDATA

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