Question about Ford F-250

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1991 ford f250 rear antilock light stays on. truck sat for a few years and had no brakes, after new master cylinder and bleeding have good brakes but rear antilock amber light stays on.

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I can't read if you change the rear brake system; you need to change your brakes and have the rear drums checked. If you just replaced the rear shoes, you might of adjused them to tight. Try backing the adjustment off. Does truck have just rear ABS or 4wheel ABS? If 4Wheel ABS it could be any of the 3 sensors. If you have an OHM meter and tell me if truck is 4x2 or 4x4 I will post resistence values for sensors.

The ABS Speed Sensor is located right on top of rear diff. The resistence of this sensor should be 800 to 3500 Ohms. If resistence is in specs, then locate the diagnostic connerctor (right under glove box) and follow this procedure.Verify the ignition switch is in the RUN position (engine does not need to be running). Next, locate the black RABS diagnostic connector C207. The diagnostic connector C207 has two mating halves, one of which has a black/orange (BK/OG) wire connected to it. Disconnect the two halves.

Attach one end of a jumper wire to the black/orange (BK/OG) wire side of the diagnostic connector C207. Ground the opposite end of the jumper wire by connecting it to a ground until the ABS light begins to flash. Grounding this wire should start the yellow ABS warning indicator flashing. If grounding this wire does not start the yellow ABS warning indicator flashing, go to the Symptom Chart of your Repair Manual.

If your truck has 4Wheel ABS it won't have C207 and you will need a scan tool to pull codes.

Also, its possible that you are interesting in read this article about how to Troubleshoot the ABS on a Ford F150.

Hope helped.

Posted on May 26, 2010

  • 3 more comments 
  • odessaaviati May 26, 2010

    I have only installed new master and bled brakes. It has front discs and rear drums , the amber light says rear antilock. It's a 4x4. I cannot seem to locate a diagnostic connector under the glove box.

  • odessaaviati May 26, 2010

    also it is a 7.3 diesel

  • ZJ Limited
    ZJ Limited May 26, 2010

    Keep in mind this info for 1991 Ford Truck F250 3/4 ton
    P/U 4WD 7.3L Diesel 8cyl...

    * The Brake Sensor - ABS is located:

    Rear differential

    * The OBD
    Diagnostic Link Connector is located:

    Under hood, driver side, upper firewall, mounted in

    corner (Application: Transmission model E4OD-E)

    Also, you'll need check Rear ABS Module...

    Fig. 1: Rear anti-lock braking system module

    The module is located on the firewall just inboard of the master

    1. Disconnect the wiring harness.

    2. Remove the 2 attaching screws and lift out the module.

    3. Installation is the reverse of removal.
    The RABS system is found on all models except the F-Super Duty and
    1993-96 Bronco models.The system constantly monitors rear wheel
    speed and, in the event of impending rear wheel lock-up in a sudden
    stop, regulates the brake fluid hydraulic pressure at the rear brakes to
    prevent total wheel lock-up, thus reducing the possibility of skidding.

    Fig. 2: Rear anti-lock braking system

    Good luck.

  • ZJ Limited
    ZJ Limited May 26, 2010

    RABS Hydraulic Control Valve
    (see Figure

    Fig. 1: Rear anti-lock braking system valve

    The valve is located in the brake lines, below the master

    1. Disconnect the brake lines from the valve and plug the lines.

    2. Disconnect the wiring harness at the valve.

    3. Remove the 3 nuts retaining the valve to the frame rail and lift
      out the valve.

    4. Installation is the reverse of removal. Don't overtighten the
      brake lines. Bleed the brakes.

    Good luck.

  • odessaaviati May 27, 2010

    Is the E40D-e an automatic this one is a speed manual with OD? I checked the resistance of the speed sensor 1.8 Ohms checked this aganst a new one measures the same. located valve assembly but can't see module is it under hood or dash? Is the C207 plug a two wire capped of plug on top of left wheel well onder hood?



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