Roadmaster 1992

Brake System Bleeding

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CAUTION
Do not move the vehicle until a firm brake pedal is obtained. Air in the brake system can cause loss of brakes with possible personal injury.

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. With the engine OFF, remove vacuum reserve by applying the brakes several times.
  4.  
  5. Fill the master cylinder with the proper grade and type brake fluid. Be sure to keep the master cylinder at least half full of brake fluid during the bleeding operation.
    NOTE
    If the master cylinder is known or suspected to have air in the bore, than it must be bled first.

  6.  
  7. Disconnect the forward brake pipe at the master cylinder.
  8.  
  9. Allow fluid to fill the master cylinder bore until it begins to flow from the forward pipe connector port.
  10.  
  11. Connect the forward pipe to the master cylinder and tighten.
  12.  
  13. Depress the brake pedal slowly one time and hold. Loosen the forward pipe connection at the master cylinder to purge air from the bore.
  14.  
  15. Tighten the connections and release the brake pedal, slowly. Wait 15 seconds and repeat sequence, including the 15 second wait. Continue until all air is removed from the bore.
  16.  
  17. After all air is removed from the forward connection, bleed the rear connection in the same manner.
    NOTE
    Calipers and/or wheel cylinders are bled only after all air is removed from the master cylinder.

  18.  
  19. To bleed the calipers and/or wheel cylinders attach a transparent tube over the bleeder valve and allow the tube to hang submerged in clean brake fluid in a transparent container.
  20.  
  21. Depress the brake pedal slowly one time and hold. Loosen the bleeder valve to purge air from the cylinder.
  22.  
  23. Tighten the bleeder screw and release the brake pedal, slowly. Wait 15 seconds and repeat sequence, including the 15 second wait. Continue until all air is removed, it may be necessary to repeat the procedure at least 10 times to expel all air.
    NOTE
    Rapid pumping of the brake pedal pushes the master cylinder secondary bore piston down in the bore in a manner that makes it difficult to bleed the rear side of the system.

  24.  
  25. Bleed all four wheels in the following sequence. Right rear, left rear, right front and left front.
  26.  
  27. Check the brake pedal for sponginess and brake warning light for indication of unbalanced pressure. Repeat the entire procedure to correct either condition.

    Click image to see an enlarged view

    Fig. Front brake lines and related components-1991-1993



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    Fig. Middle (frame) brake lines and related components-1991-1993



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    Fig. Rear brake lines and related components-1991-1993



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    Fig. Front brake lines and related components-1994-1996



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    Fig. Rear brake lines and related components with drum brakes-1994-1996



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    Fig. Rear brake lines and related components with disc brakes-1994-1996

  28.  

 
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