GM Full Size Vans 1987-1997 Repair Guide

EHCU Valve/BPMV (4WAL)

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REMOVAL & INSTALLATION



Except 1996-97 Models

See Figures 1 and 2



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Fig. Fig. 1: EHCU/BPMV mounting



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Fig. Fig. 2: ECHU/BPMV brake line connections

The EHCU valve is not serviceable. Replace the valve only when defective.

  1. Disconnect the negative battery cable.
  2.  
  3. Raise the vehicle and support it with jackstands.
  4.  
  5. Tag and disengage the electrical connections from the EHCU/BPMV.
  6.  
  7. Disconnect the brake pipes from the EHCU/BPMV.
  8.  
  9. Unfasten the retaining bolts and remove the EHCU/BPMV from its mounting bracket.
  10.  
  11. Remove the EHCU/BPMV from the vehicle.
  12.  

To install:
  1. Install the EHCU/BPMV onto the bracket. Tighten the mounting bolt to 84 inch lbs. (9 Nm).
  2.  
  3. Install the EHCU/BPMV and tighten the retainers to 55 ft. lbs. (75 Nm).
  4.  
  5. Connect the electrical connectors and hydraulic lines. Torque the line fittings to 16 ft. lbs. (25 Nm).
  6.  
  7. Bleed the system and the EHCU/BPMV.
  8.  
  9. Connect the negative battery cable, pump the brakes before road test and road test
  10.  

1996-97 Models

See Figures 3 and 4



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Fig. Fig. 3: EHCU/BPMV mounting - 1996-97 models



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