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    1953 De Soto Powermaster 4.1L 1BL 6cyl

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    GM Lumina/Grand Prix/Cutlass Supreme/Regal 1988-1996

    ABS Hydraulic Modulator/Master Cylinder Assembly

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    REMOVAL & INSTALLATION



    See Figure 1

    To avoid personal injury, use the Tech 1®scan tool to relieve the gear tension in the hydraulic modulator. This procedure must be performed prior to removal of the brake control and motor assembly.



    Click image to see an enlarged view

    Fig. Fig. 1: View of the ABS hydraulic modulator/master cylinder assembly

    1. Disconnect the negative battery cable.
    2.  
    3. For 1992-93 vehicles, perform the following:
      1. Properly relieve the fuel system pressure, as outlined in Fuel System of this repair guide.
      2.  
      3. Remove the air cleaner assembly.
      4.  
      5. For 3.1L and 3.4L engines, disconnect and plug the upper fuel lines and position aside.
      6.  

    4.  
    5. Disengage the two solenoid electrical connectors and the fluid level sensor connector.
    6.  
    7. Detach the 6-pin and 3-pin motor pack electrical connectors.
    8.  
    9. Wrap a shop towel around the hydraulic brake lines, then disconnect the four brake lines from the modulator.
    10.  

    Cap the disconnected lines to prevent the loss of fluid and the entry of moisture and contaminants.

    1. Unfasten the 2 nuts attaching the ABS hydraulic modulator/master cylinder assembly to the vacuum booster.
    2.  
    3. Remove the ABS hydraulic modulator assembly from the vehicle.
    4.  

    To install:
    1. Install the ABS hydraulic modulator assembly to the vehicle. Secure using the two attaching nuts and tighten to 20 ft. lbs. (27 Nm).
    2.  
    3. Uncap and connect the 4 brake pipes to the modulator assembly. Tighten to 13 ft. lbs. (17 Nm).
    4.  
    5. Attach the 6-pin and 3-pin electrical connectors.
    6.  
    7. Engage the fluid level sensor connector and the two solenoid electrical connections.
    8.  
    9. For 1992-93 vehicles, perform the following:
      1. Unplug and connect the fuel lines for 3.1L and 3.4L engines.
      2.  
      3. Install the air cleaner assembly.
      4.  

    10.  
    11. Properly bleed the system, as outlined later in this information.
    12.  
    13. Connect the negative battery cable.
    14.  

     
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