GM Bonneville/Eighty Eight/LeSabre 1986-1999

Pressure Modulator Valve (PMV) Assembly

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REMOVAL & INSTALLATION



1994-95 Vehicles
  1. Remove the air cleaner assembly.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Label and disconnect the following wiring connectors from the PMV assembly:
    1. Fluid level switch
    2.  
    3. Pump motor
    4.  
    5. Valve block
    6.  

  6.  
  7. Loosen or reposition the clamp on the hose at the PMV reservoir.
  8.  
  9. Disconnect the hose from the reservoir. Catch escaping fluid in a clean container, then plug the hose with a 5 / 8 inch (15.5mm) diameter plug.
  10.  
  11. Disconnect the primary and secondary brake lines at the PMV.
  12.  
  13. Disconnect the 4 brake lines from the PMV assembly.
  14.  
  15. Raise and safely support the vehicle.
  16.  
  17. Remove the lower PMV assembly retaining bolt.
  18.  
  19. Carefully lower the vehicle.
  20.  
  21. Remove the harness strap.
  22.  
  23. Support the PMV assembly, then remove the upper retaining bolts. Remove the assembly from the vehicle. If the unit is being replaced with another, the reservoir and bracket(s) must be transferred to the new assembly.
  24.  

The PMV assembly is not serviceable. Do not attempt to disassemble any part of the unit.

To install:
  1. Position the PMV assembly and install the upper retaining bolts. Tighten the bolts to 20 ft. lbs. (27 Nm).
  2.  
  3. Install the harness.
  4.  
  5. Raise and safely support the vehicle. Install the lower retaining bolt and tighten it to 20 ft. lbs. (27 Nm). Lower the vehicle.
  6.  
  7. Connect the 4 brake lines to the PMV. Tighten each line to 11 ft. lbs. (15 Nm).
  8.  
  9. Install the primary and secondary brake lines, tightening each to 11 ft. lbs. (15 Nm).
  10.  
  11. Connect the hose to the PMV reservoir and secure the clamp.
  12.  
  13. Attach the electrical connectors to the PMV assembly; make certain each connector is squarely seated and firmly retained.
  14.  
  15. Connect the negative battery cable.
  16.  
  17. Install the air cleaner assembly.
  18.  
  19. Fill the brake fluid reservoir.
  20.  
  21. Fill and bleed the hydraulic brake system, then perform the "Auto Bleed Procedure" as outlined in this section.
  22.  
  23. Clean any spilled brake fluid from the PMV assembly and surrounding area to prevent damage to other components or paint work.
  24.  

1996-99 Vehicles

On 1996-99 vehicles, the PMV is referred to as the Brake Pressure Modulator Valve (BPMV), and is attached to the EBCM/EBTCM.


CAUTION
Due to safety reasons, the BPMV must be repaired or disassembled, the complete unit must be replaced. With the exception of the EBCM/EBTCM, no screws may be loosened. If the screws are loosened, it will not be possible to get the brake circuits leak-tight and personal injury may result.

  1. Make sure the ignition switch is in the OFF position, then disconnect the negative battery cable.
  2.  
  3. Remove the air cleaner assembly and the PCM cover.
  4.  
  5. Detach the EBCM/EBTCM electrical connector and motor ground cable connector.
  6.  
  7. Disconnect the brake pipe fittings, using a flare nut wrench. Note the location of the pipes for installation purposes.
  8.  


WARNING
When removing the BPMV, protect the vehicle's painted surfaces from possible brake fluid spillage. Do not allow any brake fluid to come in contact with a painted surface; it will damage the paint.

  1. Remove the EBCM/EBTCM bracket and mounting bolt.
  2.  

Reposition the brake pipes as necessary to remove the BPMV. Excessive bending may damage the pipes.

  1. Remove the upper BPMV bracket from the frame rail.
  2.  
  3. Remove the EBCM/BPMV assembly from the vehicle.
  4.  
  5. Unfasten the 4 EBCM-to-BPMV bolts, then separate the EBCM from the BPMV, pulling rearward until separated.
  6.  


WARNING
Do NOT pry the EBCM/EBTCM. Be careful not to damage the seal, if reusing the module. If the seal gets damaged during removal, repair with a suitable silicone sealer or replace the module.

  1. Clean the EBCM seal and BPMV gasket surface with alcohol.
  2.  

To install:
  1. Position the EBCM to the BPMV. Tighten the 4 mounting bolts to 40 inch lbs. (4.5 Nm), and the center bolt with the bracket to 10 ft. lbs. (14 Nm).
  2.  
  3. Position the BPMV bracket to the BPMV. If a new BPMV is being installed, remove the shipping plugs from the valve openings.
  4.  
  5. Place the EBCM/BPMV assembly into the vehicle. Tighten the frame rail bracket bolts to 106 inch lbs. (12 Nm).
  6.  


CAUTION
Make sure the brake pipes are correctly connected to the BPMV. If the pipes are accidentally switched, wheel lock-up will occur, causing possible personal injury. The only 2 ways this condition can be detected are with a scan tool, or performing an "anti-lock" stop.

  1. Connect the brake pipe fittings, in the locations noted during removal. Tighten the fittings to 13 ft. lbs. (18 Nm).
  2.  
  3. Attach the EBCM harness connector and the motor ground cable connector. Make sure the lock tab is securely fastened.
  4.  
  5. Install the PCM cover and air cleaner assembly.
  6.  
  7. Connect the negative battery cable.
  8.  
  9. Fill and bleed the hydraulic brake system, then perform the "Auto Bleed Procedure" as outlined in this section.
  10.  

 
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