I was installing a mcmaster vacuum manifold for my turbo setup and noticed when i took off my brake booster line that there was some built in pressure on the line towards the actual booster...
upon investigation I noticed there was a check valve type insert inside the line allowing pressure to only go one way...
what does this do and does this alter the way vacuum required parts perform??
I always hear people say their BOV functions better (and sometimes louder) using the brake booster line so I was interested.

thanks!

 

i put a golden eagle vaccum box on my car and it pulled better vaccum and my bov did get louder. i love the way it looks on the car.
for golden eagle

 

I think that check valve is so the brake booster will never see positive pressure because if it does, it would accually make the brakes harder to press. thats what I think anyway, and yea I have the same manifold and my bov is much more responsive.

 

Whatever you do, do not TEE your source to the right of the check valve (when facing the car). Can we say no brakes.

 

Yeah, find a way to put the vacuum log in between the intake manifold and the brake booster check valve. Then make sure the E and arrow on the check valve is pointing towards the intake manifold. What ever you do KEEP the check valve, unless you aren't afraid of dying.

 

Yeh dont tee anything into the right side of the check valve.. I had an experiece with my wastegate hooked up there and can you say MAJOR BOOST SPIKE! It sucked

 

don't worry,
i pulled the brake booste line off the intake manifold and put the vacuum inline to that

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mademan2723 &raquo;</TD></TR><TR><TD CLASS="quote">Yeh dont tee anything into the right side of the check valve.. I had an experiece with my wastegate hooked up there and can you say MAJOR BOOST SPIKE! It sucked </TD></TR></TABLE>

Damnit, I knew for some weird reason I shouldn't have done that.
I hooked my GE vacuum manifold into the line right after the funky bend coming off wherever the line runs to. To kind of keep the tee hidden I guess. I turn the car on and my gauge doesn't work. step on the gas...nothing. Hit the brakes....wham it goes down. I'm like WTF.
Anyway, so now I have to go find me a 3/8" connector so I can fix my fuckup and hook the manifold into the right place. Grrrrr.
I guess I should start searching before doing anything on this damn car. Even things that seem soooo simple. You learn something new every day.

 

Does it make a difference really? Because the only time you're going to be on the brakes is when you're off the throttle and the engine is in full vacuum (I guess unless you're doing some left-foot braking). Or does the brake booster suffer damage from seeing boost?

 

What size are your guys' T's and where are you guys getting them? I have no idea where to look.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by danoonez &raquo;</TD></TR><TR><TD CLASS="quote">Does it make a difference really? Because the only time you're going to be on the brakes is when you're off the throttle and the engine is in full vacuum (I guess unless you're doing some left-foot braking). Or does the brake booster suffer damage from seeing boost?</TD></TR></TABLE>

the check valve in the line prevents the brake booster from ever seeing boost... so t'ing off of that would show no boost to any of your devices

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by igo4bmx &raquo;</TD></TR><TR><TD CLASS="quote">

the check valve in the line prevents the brake booster from ever seeing boost... so t'ing off of that would show no boost to any of your devices</TD></TR></TABLE>

I know, but getting rid of the check valve wouldn't hurt the brakes. Or at leas that's what I was asking.

 

losing the check valve on an NA car just makes the brakes mushy. It will still stop. I haven't had the inclination to try it on a boosted car though...unless you are slamming on brakes under boost (difficult) I really don't see it being life threatening. It is definitely not a good idea though. Brakes are one of the features on my car I like to be fully functional.

 

Why would anyone consider removing the check valve in the first place?

 

 

Sorry for draggin up and old post...but it has a good picture
Where is the check valve along the brake booster line?
Is it that grey circular thing, right against the fire wall?

 

yes thats it, on some cars it is actually pressed in inside of the hose in between the bracket on the firewall, that little hump.

 

Yep, just put the van manifold before the check valve, then your fine.

 

damn that golden eagle manifold looks clean. I'd like to get one

 

The check valve's function is to retain vaccum within the brake booster so that the power assist function is not lost during moments of low manifold vaccum.

 

what they said, heres a pic of mine:

 

What do does manifolds run?

 

you can get the golden eagle manifold in the fi sponsor section for $39

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHC_MShue &raquo;</TD></TR><TR><TD CLASS="quote">damn that golden eagle manifold looks clean. I'd like to get one </TD></TR></TABLE>

I wish I had room for one.

 

why dont you? you can mount it almost anywhere, just need a long enough vacuum hose.