Jeep Wrangler/YJ 1987-1995 Repair Guide

Master Cylinder

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See Figure 1

REMOVAL & INSTALLATION



  1. Disconnect the pedal sensor wires.
  2.  
  3. Remove the clamps that attach the reservoir hoses to the HCU pipes, remove the hoses and allow them to drain into a container before removing the reservoir.
  4.  
  5. Pump the brake pedal to exhaust all vacuum from the power brake booster.
  6.  
  7. Disconnect the necessary brake lines at the master cylinder and combination valve. Remove the combination valve bracket bolt.
  8.  
  9. Remove the nuts attaching the master cylinder to the booster mounting studs, then pull the master cylinder forward and off the studs.
  10.  

To install:

If a new master cylinder is being installed, bleed the cylinder on a bench before installation.

  1. Position the master cylinder to the booster.
  2.  
  3. Connect the reservoir hoses to the HCU pipes.
  4.  
  5. With the master cylinder and booster properly connected, install and tighten the attaching nuts to 25 ft. lbs. (34 Nm).
  6.  
  7. Connect the brake lines to the master cylinder.
  8.  
  9. Connect the sensor wires.
  10.  
  11. Fill and bleed the brake system.
  12.  



Click image to see an enlarged view

Fig. Fig. 1: ABS hydraulic component locations

 
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