Vacuum - it really sucks!!!
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Joined: May 2005
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Vacuum - it really sucks!!!
Actually, I don't think it's suckin' hard enough! Here's the deal. I finished my 383 stroker and dropped it in. In addition to fixing/replacing several things, I also replaced all four calipers and bled the lines but the brake light is still on. Whereas, before exchanging engines, when I hit the brakes I'd feel the pedal go solid at about an inch in. Now, the pedal goes down about 3/4 of the way before it's solid. I ran a vacuum check today (at the front port of my Holley 4160) and it was pulling 15 inches. I've read somewhere that it should be about 20 to 22 inches for the power brake booster and the headlights to function properly. But obviously, if you've got a performance cam, you're going to lose some vacuum. I've got a fairly lopey cam, but nothing majorly radical (480 lift/232 at .050) IF this is the reason, i.e. not enough vacuum, can you suggest a good vacuum pump I should get? Or any other ideas/suggestions?
Thanks, Marc.
Thanks, Marc.
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Joined: Nov 2003
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From: Apollo PA
possibly....
Have you checked the one way valve on the booster? That's the plastic plug the vacuum line connects to. If it dies, that can have a pretty adverse effect on your brakes... just a thought. 
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Joined: May 2005
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Originally Posted by c4power
Have you checked the one way valve on the booster? That's the plastic plug the vacuum line connects to. If it dies, that can have a pretty adverse effect on your brakes... just a thought.
