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Old 08-02-2010, 10:49 AM   #1
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Default brake booster valve fail

Ok so I'm tinkering around with vacuum lines this weekend to hook up my bov and mbc. since my bov is now on the hotside piping and I don't want to run a long *** line all the way to the mani, I decide to tap into the power steering booster line that connects to the intake mani.

That's fine and dandy and many have done it, except I'm tapping into it AFTER the hard line and right before the booster. On the drivers side. Well, when cutting the line I noticed a little valve inside of it.

It appears that the valve is a check/1way valve, opens to let the IM suck air out of the booster (or allow booster to relieve pressure into manifold) but not the other way around.

I damaged this valve while cutting the line cause I didn't know it was there(inside the hose)

What are my options?
-Are there similar valves I can pick up at a local o'reillys, auto-zone, etc?
-Is it something insignificant enough to not worry about?
-Is it expensive from mazda?

Anyone have any input on this?
Everything was going so smoothly of course this had to happen

Last edited by 18psi; 08-02-2010 at 02:16 PM.
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Old 08-02-2010, 10:53 AM   #2
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replace the line, the one from mazda has the check valve in it. Without it, panic stops from full throttle will be difficult and under boost it would probably be impossible to use the brakes.
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Old 08-02-2010, 11:04 AM   #3
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oh ****. so definitely big deal then.

damn it.

anyone know if any parts stores sell a 1way/check valve like that? mazda will probably bend me over and **** me sideways for it.
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Old 08-02-2010, 01:59 PM   #4
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since when do we have power steering boosters? Do you mean brake booster or is the NB such a strange car that it has **** like that, eitherway you will probly need to go to mazda directly unless you feel confident in your abilitie to just put a tight pcv vavle in the mix and go from there.
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Old 08-02-2010, 02:16 PM   #5
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Yeah brake booster is what I meant. lol
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Old 08-02-2010, 02:46 PM   #6
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napa might be able to hook u up

I can't see that hose costing >$20, even with the built in check valve
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Old 08-02-2010, 09:24 PM   #7
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why not a salvage place like partsgroup or planetmiata...?
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Old 08-02-2010, 10:48 PM   #8
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I'll call around. Thanx.
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Old 08-03-2010, 07:37 PM   #9
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These are the BRAKES we are talking about here. If they are cheap, maybe get a new one? Just a thought. You're cool 18, want to keep you around
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Old 08-03-2010, 07:49 PM   #10
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Quote:
Originally Posted by ZX-Tex View Post
These are the BRAKES we are talking about here. If they are cheap, maybe get a new one? Just a thought. You're cool 18, want to keep you around
haha thanx
I called around and no one has anything that would actually fit.
Going to be calling mazda in a minute.
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Old 08-04-2010, 08:09 PM   #11
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So I call up mazda and they want something like 36 bux for this ****.

Then I get a great idea to visit the mazda scrap yard not far from my work. Guy had like 3. I got a near new one off an 02 and he wanted 5 bux for it.

I look in my wallet and only have 3. Tell him "as stupid as it sounds, looks like I'll have to use my ATM card"
-"how much do you have?"
-"3 bux"

Just take it.
I gave him the 3 bux and told him to buy himself a beer for beeing so cool

SCORE
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Old 08-04-2010, 08:16 PM   #12
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Nice!
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Old 08-05-2010, 12:22 PM   #13
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If it makes you feel any better, many V8 swap guys have not put the line back in, not knowing what fine jewel was within it. The result is a rock solid brake pedal and a face when they try to stop the car.
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Old 08-05-2010, 12:45 PM   #14
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hahhaha holy **** I can imagine how badly they **** their pants on that 1st drive
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Old 08-11-2010, 01:56 PM   #15
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Quote:
Originally Posted by chpmnsws6 View Post
If it makes you feel any better, many V8 swap guys have not put the line back in, not knowing what fine jewel was within it. The result is a rock solid brake pedal and a face when they try to stop the car.
Haha. My dad had a '66 El Camino that we put a healthy 454 in, it didn't have a brake booster and I made that face the first time I drove it

I'm glad I read this thread though, I was thinking about cutting my line to do the same thing.
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Old 08-14-2010, 07:06 PM   #16
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my one way valve failed bigtime.. making sure i had 22psi of boost in the brake booster, instead of a nice vacum at the end of the straight.. things got a bit stressfull
absolutly rock solid pedal, NO brakes whatsoever, until the vacum of the engine(after i released the throttle) had pulled the air out of the booster. it only lasted for maybe less than one second, but at 120+mph. thats a bit much..

installed a new hose from mazda, problem solved.
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Old 08-14-2010, 08:56 PM   #17
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I carry an extra valve/hose to the track with me.
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