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: Power brakes Vacuum question lev8trmn Dec 13th, 08, 6:41 PM I have a 72 Chevelle with power front disc and rear drum. I bled the master and all the lines to removed all air pockets. I'm confident that was done properly. My brake system is all new. I ran my vacuum line from the booster to the upper intake of my 502 Ram Air engine. I started her up for the first time the other day. The pedal is spongy and I was wondering if I'm getting enough vacuum. What is a good vacuum number I should be looking for? robo3 Dec 13th, 08, 9:36 PM 12 to14 i put all new brakes on a 70 and had a bad brand new vaccume booster! bought a nother booster and had awsome brakes lev8trmn Dec 13th, 08, 11:37 PM 12 to14 i put all new brakes on a 70 and had a bad brand new vaccume booster! bought a nother booster and had awsome brakes 12 to 14? I hear people talking about 18 and 20. Is there a maximum? danhalt Dec 14th, 08, 12:40 PM 12 to 14? I hear people talking about 18 and 20. Is there a maximum? More is better but 12-14 will get you a good pedal troposcuba Dec 14th, 08, 2:16 PM add to that... i can tell ya from personal experience, low vac. will not make the pedal spongy, it will be hard as a rock! lev8trmn Dec 14th, 08, 6:38 PM add to that... i can tell ya from personal experience, low vac. will not make the pedal spongy, it will be hard as a rock! Is there such a thing as too much Vacuum? Other than air in the system, what else would make a pedal spongy? | ||