Astro, Safari 1997-2005

Pressure Bleeding

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NOTE
The following procedure requires the use of the GM Brake Bleeder Adapter tool No. J-29567 or equivalent, and the GM Combination Valve Depressor tool No. J-35856 or equivalent.

  1. Using the GM Brake Bleeder Adapter tool No. J-29567 or equivalent, fill the pressure tank to at least 1 / 3 full of brake fluid. Using compressed air, charge the pressure tank to 20-25 psi. (138-172 kPa), then install it onto the master cylinder.
  2.  
  3. Using the GM Combination Valve Depressor tool No. J-35856 or equivalent, install it onto the combination valve to hold the valve open during the bleeding operation.
  4.  
  5. Bleed each wheel cylinder or caliper in the following sequence: right rear, left rear, right front and left front.
  6.  
  7. Connect a hose from the bleeder tank to the adapter at the master cylinder, then open the tank valve.
  8.  
  9. Attach a clear vinyl hose to the brake bleeder screw, then immerse the opposite end into a container partially filled with clean brake fluid.
  10.  
  11. Open the bleeder screw 3 / 4 turn and allow the fluid to flow until no air bubbles are seen in the fluid, then close the bleeder screw.

    Click image to see an enlarged view

    Fig. This tool is used to depress the combination valve plunger to allow proper flow of brake fluid during bleeding



    Click image to see an enlarged view

    Fig. The GM Pressure Bleeder adapter, J-29567 or equivalent, is needed when using this bleeding technique

  12.  
  13. Repeat the bleeding process to each wheel.
  14.  
  15. Inspect the brake pedal for sponginess and if necessary, repeat the entire bleeding procedure.
  16.  
  17. Remove the depressor tool from the combination valve and the bleeder adapter from the master cylinder.
  18.  
  19. Refill the master cylinder to the proper level with brake fluid.
  20.  

 
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