Subaru Car 1998-05

Hydraulic Control Module

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Removal & Installation





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Fig. ABS hydraulic assembly and mounting bolts in engine compartment-1997

ABS hydraulic assembly and mounting bolts in engine compartment-1997
  1. Disconnect the harness connectors at the hydraulic unit.
  2.  
  3. Remove the emission canister from the engine compartment to allow access.
  4.  
  5. Disconnect the inlet and outlet lines from the top of the actuator. Label the lines before removal; exact reinstallation is required.
  6.  
  7. Immediately plug the lines and ports to prevent entry of dirt and debris into the system.
  8.  
  9. Remove the screw holding the ABS relay cover and remove the cover.
  10.  
  11. Remove the bolts holding the hydraulic unit bracket to the body. Note that one of these bolts has the pump motor ground lug attached.
  12.  
  13. Lift the actuator and bracket clear of the vehicle. Keep the unit upright at all times; do not drop or bump it.
  14.  
  15. The brackets and relays may be removed for transfer to a replacement unit.
  16.  
  17. Except for the 2 relays, the hydraulic unit contains no replaceable components. Never attempt to disassemble the unit or repair it.
  18.  

To install:

  1. Install or transfer the relays and brackets. The nuts on the bushing bolts holding the hydraulic unit to the brackets should be tightened to 6 ft. lbs. (8 Nm).
  2.  
  3. Install the hydraulic unit and brackets into the engine compartment. The nuts and bolts holding the brackets to the body should be tightened to 25 ft. lbs. (34 Nm). Make certain the pump motor ground lug is engaged beneath the proper bolt.
  4.  
  5. Check that the relays are firmly seated in place. Install the relay cover box and tighten the screw just snug. Do not overtighten. Install the remaining components in the reverse order of removal.
  6.  
  7. Bleed all 4 wheels, then bleed the hydraulic actuator. Both the primary and secondary circuits must be bled.
  8.  

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the air intake assembly.
  4.  
  5. Use an air gun to remove any water that may be around the hydraulic control module.
  6.  
  7. Pull on the lock of the control module connector to remove it.
  8.  
  9. Disconnect the electrical connector of the control module.
  10.  
  11. Unlock the cable clip.
  12.  
  13. Disconnect the brake lines from the control module. Matchmark the brake lines before removal.
  14.  
  15. Remove the hydraulic control module from the engine compartment.
  16.  

To install:

  1. Install the hydraulic control module into the engine compartment.
  2.  
  3. Connect the brake lines to the correct locations on the control module.
  4.  
  5. Using the cable clip, secure the wiring harness to the bracket.
  6.  
  7. Connect the electrical connector to the control module.
  8.  
  9. Install the air intake assembly.
  10.  
  11. Connect the negative battery cable.
  12.  

 
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