Jeep Wrangler/YJ 1987-1995 Repair Guide

Hydraulic Control Unit (HCU)

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REMOVAL & INSTALLATION



See Figures 1 and 2



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Fig. Fig. 1: ABS hydraulic component locations



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Fig. Fig. 2: HCU mounting

  1. Place shop towels or a small container under the master cylinder reservoir hoses and disconnect those hoses at the HCU.
  2.  
  3. Disconnect all sensor and harness wires at the HCU.
  4.  
  5. Mark or tag or installation reference, then disconnect the brake lines at the ECU.
  6.  
  7. Remove the bolt and nuts attaching the HCU mounting bracket to the fender apron and remove the HCU.
  8.  

To install:
  1. Position the HCU mounting bracket to the fender apron and install the bolt and nuts.
  2.  
  3. Connect the brake lines to the ECU.
  4.  
  5. Connect all sensor and harness wires to the HCU.
  6.  
  7. Connect the master cylinder reservoir hoses to the HCU.
  8.  
  9. Fill and bleed the brake system.
  10.  

 
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