ISUZU Amigo/Pick-ups/Rodeo/Trooper 1981-1996

Combination Valve

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See Figure 1



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Fig. Fig. 1: Combination valve in between the master cylinder and individual brakes

REMOVAL & INSTALLATION




WARNING
Clean, high quality brake fluid is essential to the safe and proper operation of the brake system. You should always buy the highest quality brake fluid that is available. If the brake fluid becomes contaminated, drain and flush the system, then refill the master cylinder with new fluid. Never reuse any brake fluid. Any brake fluid that is removed from the system should be discarded.

Combination valves on Isuzu vehicles are mounted in two locations: (1) on the master cylinder, inline with the rear brake lines and (2) on the frame rail below the master cylinder.

Without ABS
  1. Disconnect the negative battery cable.
  2.  
  3. Unfasten the harness attached to the bracket on top of the valve, if equipped.
  4.  
  5. Tag and disconnect the brake lines at the combination valve. Immediately plug the lines to prevent system contamination or excessive fluid loss.
  6.  
  7. Remove the proportioning valve retainer bolts, then remove the valve.
  8.  

To install:
  1. Position the combination valve in place and secure with the retainer bolts. If the valve is equipped with a warning sensor harness, the bracket for the harness must be installed between the valve assembly and the bolt head. Tighten the bolts to 51 inch lbs. (6 Nm).
  2.  
  3. Connect the warning sensor harness.
  4.  
  5. Install the brake lines to the combination valve. Tighten the brake lines to 12 ft. lbs. (16 Nm).
  6.  
  7. Connect the negative battery cable.
  8.  
  9. Bleed the brake system.
  10.  

With ABS

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the hydraulic lines from the combination valve one at a time. Immediately plug all openings to prevent system contamination or excessive fluid loss.
  4.  
  5. Disengage the electrical connector from the combination valve pressure switch.
  6.  
  7. Disengage the RWAL pressure valve connector.
  8.  
  9. Remove the master cylinder/combination valve-to-bracket retaining nuts, then remove the valve from the vehicle.
  10.  
  11. Remove the RWAL pressure valve.
  12.  

The combination valve is not repairable and must be replaced as a complete assembly.

To install:
  1. Install the RWAL pressure valve.
  2.  
  3. Install the combination valve and bracket assembly, then install and tighten the master cylinder/valve bracket retaining nuts.
  4.  
  5. Engage the RWAL pressure valve connector.
  6.  
  7. Engage the pressure switch electrical connector.
  8.  
  9. Remove the caps (one at a time) and connect the brake lines to the combination valve, then tighten the fittings to 12 ft. lbs. (16 Nm).
  10.  
  11. Connect the negative battery cable.
  12.  
  13. Check and refill the master cylinder reservoir, then properly bleed the hydraulic brake system.
  14.  

 
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