Hapkido_FC

well I have been searching all over the old threads and saw that someone once said that a bad vaccum leak made the brakes go out, well I seem to have a very very very small vaccum leak that was corrected, but my breaks are still not working. well its really the booster that is not working, ive changed the booster 2 times along with the master cylinder and all, but I still have no brakes. can anyone help me out? thanks

Syonyk

Are you getting vaccum to the booster? There's a check valve in the final bit of tube going to the booster. If that check valve is somehow stuck, it could prevent the booster from ever getting engine vacuum.

Do you have *no* brakes, or just no power assisted brakes?

-=Russ=-

Hapkido_FC

Russ, i have no power assisted brakes. seems that air blows out of the end of that tube but does not suck it back in, is this normal?

Kai

uhh... is the check valve in backwards? If you already changed the booster, there's not much it can be. The booster doesn't need a whole lot of vacuum.

emac

it's very likely that the booster can't pull vacuum with the vacuum leak so there is no power brakes. find the vac leak.

Kai

I would imagine the engine would stall out with a vac leak that big.

Syonyk

Which way is the air able to flow? From the brake booster to the engine, or from the engine to the brake booster?

The end of the tube attached to the brake booster should be SUCKING. There's a hidden check valve in there (unlabeled, of course). If it's backwards, you'll have problems.

-=Russ=-

Hapkido_FC

thanks guys for all the help, we got this bad boy stopping again i will need to replace the master cylinder though. the damn tube inside had a valve that had a bettle dead stuck in there, how did it get there??? my mech was like, WTF. then again, i did get this brake booster from a junk yard that was already taken off, but still that baffles me.

again, thanks guys for giving me some helping words.