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Discussion Starter #1
I'm only getting one to two good brakes then the power assist goes away. I'm assuming I lack vacuum. Last I checked the motor only produce about 13hg. Do you guys run a vac pump and which do you use and where have you mounted it? Thanks D. It's a 383 stroker. non power steering car, front disc, rear drum. Just asking before I spend 300 bucks.
 

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If the first two times you brake it works well then your motor pulls enough vacuum.
If a few repeated times pressing the brake pedal means you run out of assist, it seems to me like you need more volume of vacuum.
Try adding a vacuum can, also double check your check valve to make sure your holding vacuum in the booster.
 

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Discussion Starter #3
It does hold vacuum, but I think, and from what I read I might need more. I read a lot of forum entries here and in chevelle, that a canister may or may not work. I have a pretty big cam in the car. That's probably why. A booster pump will work right? I don't mind spending the money if it works all the time. I know it is never more than 13hg at best. All I've read is you need at least 17-18
 

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13" is not enough for good quality braking. Cans do nothing, they hold more of nothing. The reason the brakes feel good at first is because at higher speed(foot not into the throttle) your vac is higher than at idle, couple pumps, slowing down and engine vac is non-existent (13") Pumps work great if you don't mind the little noise, much like a elec fuel pump.
 

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My vac brakes were fine @ 12" vac.
Mine too, and they're four wheel discs which supposedly need more than just front discs.

The check valve on my booster was bad right out of the box. Check it out....just pop it out of the booster and see if you can blow through it one way only or both ways. Both ways would mean it's bad.
 

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As above, look for something leaking. Z's pull even less vacuum at idle and the power brakes work fine.

Bad check valve, bad booster, or misadjusted rod-booster setup.

alan
 
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