If you are using the old two person "pump and bleed" method of flushing your brake lines - do you need to have the ignition switch in the "on" position to utilize the booster? If I try to bleed with the switch off and the bleeder screw wide open...I get a very small trickle of brake fluid or none at all.

Any suggestions?

 

I guess you could do that, but its not something needed. I dont I have ever used the brake booster (eng running) to bleed brakes though. Maybe if the person holding the pedal is barely pushing it thats why your not getting much fluid? I dont even push the pedal hard, you shouldnt have to do that either.

 

Thanks for the reply. I have my very small petite wife pressing the pedal...perhaps I have found the problem.

 

Yep, probably. Knowing that, it will help to start it up and let the brake booster help her.