Vacuum Bleeding Procedure

Vacuum Brake Bleeder:

Normal Fluid Foaming Conditions:

1. Connect Vacuum Bleeder (GM Dealer Equipment #85 00001) to a source of compressed air.


2. Uncap the brake master cylinder reservoir.

3. Depress the level on the top of the bleeder tool to create a vacuum. Use the bleeder hose to vacuum the old brake fluid out of the reservoir.

4. Fill the master cylinder reservoir with fresh brake fluid of the specified type. Periodically check the reservoir fluid level to avoid running it dry.

5. Clean the bleeder screws and bleed holes, if necessary.

6. Connect the vacuum bleeder hose to the bleed screw, and open the bleed screw slightly.

7. Depress the vacuum bleeder lever to create vacuum and begin the bleeding process according to the brake bleeding procedure. Watch the flow of brake fluid; continue bleeding until about 10 seconds after clean fluid flows into the bleeder container.

8. Release the vacuum bleeder lever and close the bleed screw.

9. Repeat the procedure as necessary to fully bleed the brake hydraulic system.

10. Check brake pedal feel for firmness; repeat the bleeding procedure as necessary.

NOTE:

It is normal to observe bubbles or foam in the vacuum hose when using the vacuum bleeder. This air is drawn into the fluid flow from around the bleed screw threads. It has no effect on bleeding.