How to Install an ABS Relay in a Ford Focus

Written by ehow cars editor
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The ABS relay is integrated into the control module on the Ford Focus which in turn is incorporated into the Hydraulic Control Unit. To install a new unit in the Ford Focus requires a moderate amount of skill. The area must be kept clear of contamination and care must be taken when working with the ABS in the Focus. The Hydraulic Control Unit will have to be factory standard.

Skill level:
Moderately Easy

Things you need

  • Screwdriver
  • Shop towels
  • Flashlight
  • Wrench
  • Replacement unit
  • Floor jacks
  • Jack stands

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    Removing the Unit

  1. 1

    Turn the ignition to OFF. Disconnect the negative cable on the battery and the connector for the low brake fluid indicator light before raising the vehicle and using jack stands to secure the wheels.

  2. 2

    Remove the reservoir filler cap and front wheels. Loosen the bleeder screw and drain the brake fluid reserve.

  3. 3

    Lower the vehicle and put the brake fluid reservoir cap back on before removing the air cleaner and outlet tube.

  4. 4

    Take off the battery junction box and set move it out of the way in order to disconnect the electrical connector on the ABS module.

  5. 5

    Disconnect the brake tubes on the hydraulic control unit and unclip the tubes. Be sure to plug the tubes in order to prevent contamination. Remove the tubes from the HCU to the master cylinder.

  6. 6

    Unhook the wiring harness and remove the bolts from the support bracket on the HCU and lift out the assembly as a whole.

    Installing the Replacement Unit

  1. 1

    Reinstall the HCU into the bracket and connect the wiring harness.

  2. 2

    Unplug the brake tubes and reconnect the Master Cylinder to the HCU. Tighten the nuts to 13 foot pounds of torque.

  3. 3

    Reconnect the brake tubes to the clip assembly and attach the brakes tubes to the HCU. Tighten the nuts to 97 inch pounds of torque.

  4. 4

    Hook up the ABS electrical connector. Slip the connector in slowly to guarantee it is seated properly.

  5. 5

    Reconnect the battery junction box and electrical connector. Tighten the bolts before putting the air cleaner and outlet tubes in place.

  6. 6

    Bleed the brakes system. Use only approved brake fluid to avoid damaging the Ford Focus.

Tips and warnings

  • Brake fluid is toxic. Avoid contact with hands and eyes.
  • The hydraulic control unit (HCU) must be removed and replaced as an assembly.

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