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Old 03-13-2009, 09:00 PM
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A final brake question

Ok guys HELP!! I've read this forum until I'm blue in the face!! I know everyone is trying to help but wow I'm confused!! Here is my deal. 2002 S10. Manual brake master cylinder on the firewall .I moved the brake pedal stud up one inch to give me a 6-1 pedal ratio Now here's what I want to do. From the back brake port I want to plum an adjustable proportioning valve. To the front brakes a standard Hurst line lock installed the normal way.Will this be good? Here are a couple questions.
1. Do i need a 10# residual valve to the back brakes? Some guys say yes some say no.
2. Do I need a disc/drum combination valve? Again some say yes and no!
I want to keep this as simple as I can. HELP

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Old 03-13-2009, 09:31 PM
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If your current master cylinder has a residual pressure valve installed in the rear port, you are good to go. It's easy to check, just take a paper clip, or other blunt small wire object and put it gently inside the port..if you feel something springy about 1/2" or so inside the port, there is an RPV...if you feel no resistance at all, and the wire will go in the port a ways, you should run a 10# rpv along with your adjustable proportioning valve.

You should run a metering valve in the front lines, a combination valve has one. It is not an absolute necessity, but it will make low speed stops a little easier on the front brakes. If you ever get on slippery surfaces (like you will hit ice in Hawaii),or sand on top of pavement, the fronts will lock up before the rears, in light pedal applications.

I've done a few systems without them, but like the way they keep the fronts from skidding, so I have taken to using either a rear prop valve with a stand alone metering valve or a combination valve.

A typical aftermarket combination valve usually does not have a 10 or 2# residual pressure valve.

A disc/drum combination valve has a metering valve and a rear proportioning valve, as well as a shuttle valve to tell you if you lost pressure in one end of your system...These are stock on most all disc/drum systems.

A disc/disc is the same rear prop valve and shuttle valve, but has no metering valve.

Hope this helps.
Later, mikey
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Old 03-13-2009, 09:35 PM
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1. No.
2. depends on mc u are using.
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