Thread: Low Power brake booster vacum

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I removed the vacum hose while running and there is vacum. If I leave the hose off the idle goes up but the engine does not die. Does this mean I have another problem I should be looking for ?

Originally Posted by Jim Standley

I removed the vacum hose while running and there is vacum. If I leave the hose off the idle goes up but the engine does not die. Does this mean I have another problem I should be looking for ?

no thats pretty standard.

Well I found part of the problem, or a combo of problems.
1) The correct vacum line helped.
2) When I installed the master push rod that attaches to the brake pedal assy, I did not line the rod up so it pushed in at the correct angle. Once I corrected this the hard pedal became more free but still a little firm/mushy. I will rebleed the brakes and give it another try. I will let you know the out come. Thanks for all the help. have a great X-mas.

Here's the update. I bleed the brakes again and still not much more improvment. I put the car on jacks started it, put my foot on the brake pedal and had someone turn the tires, the fronts grab good but the back do not. I put it in gear so the back tires turned and applied the brake, the rear tires continued to turn. I checked the rear drum brakes and all looks good. The master, proportioning valve,brake lines and wheels cyclinders are all new. Could there be air trapped in the proportioning valve ?