Join Date: Jan 2001
Location: 115 Hidden Bay Dr. Sumter, SC
Power Brake Booster Problems
I just completed a 4 wheel power disc conversion from 4 wheel drum non power on my 69 and finally got the brakes bled after many long hours of trying everything. I have good hard pedal and no air from the bleeders but when I hooked up the booster and started the car the pedal got real soft. I drove it around the block and it would stop ok but the pedal almost went to the floor. I bled some more and got no air but still soft pedal when car is running. I have some pedal at idle but when RPM's are up it goes almost to the floor. I put a vacuum gage in the hose going to the manifold and at idle I got 10 inches, with more RPM's it goes down then up to 18-20 inches. How do you correctly check to see if I have the correct vacuum which I know is 18 inches? Any help will be greatly appreciated. Jack
ZFINE69/69Z (Clone) Hondorus Maroon W/Black Stripes, Original White Interior, 350 W/Edelbrock Crossram, 4 Speed, 355 12 Bolt, S/S Cragers
Last edited by jbrode20012000; Feb 12th, 06 at 07:08 PM.