Porportioning Valve Question

[wldhors2]

I have a 67 Camaro that I am working on, Wilwood front and back disc brake set up, Hydroboost with Wilwood master cylinder.
Do I need a proportioning valve for the back brakes or can I just leave my lines hooked up to the distribution block then
to the new master cylinder, the car is only going to be street driven.

Thanks, Ron

[WallaceMFG]

If I recall correctly you will need to replace the stock distribution block because it has internal valving for drum brakes built in. If you have a new distribution block for the disc brakes then in my opinion you'd be fine for street driving.

[Apogee]

The stock distribution block from a '67 Camaro is just that, a distribution block. It has no metering, proportioning, or any other functionality built into the block other than a brake balance switch to trigger the brake warning light on the dash, so you can leave it or remove it with no negative results. Residual pressure valves for drum brakes were generally installed in the outlet ports of the master cylinder.

As for your question regarding proportioning valves, I would recommend that you add an adjustable unit so that you can fine tune your rear brake bias relative to the front for your given application. Wilwood makes several options including their 260-10922, 260-11179, 260-13190, etc., depending on the configuration you prefer, but they all function similarly. If you install an adjustable proportioning valve between the MC and brake balance switch in the distribution block, then it can trigger the brake warning light under heavy braking due to the front to rear pressure imbalance caused by the valve.

Tobin
KORE3

[wldhors2]

Thanks guys for the help
I ended up plumbing in a Wilwood adjustable proportioning valve.

Thanks again, Ron

[icemanrd19]

My wilwood proportioning valve triggers the warning light when I press the brake pedal. Doesn't matter how hard I push it. I'M also running the hydra boost setup. Too much pressure or not adjusted correctly?

[icemanrd19]

Z06 brakes, hydratech system, wilwood prop valve.

[icemanrd19]

Nevermind. That switch is for the brake lights not low fluid. Stupid me

[oleyeller]

What about the valve under the driver side rocker where the two lines are joined together, is that not a pressure regulating valve... see picture part way down on Davids brake page, it should have to go also???,,,,,????https://www.google.com/url?sa=i&rct=...173366&cad=rjt

[ccmc]

Yes, that valve under the driver seat needs to go, just put a straight through connector in it's place.

[ctcz28]

As for the proportioning valve under the driver's seat mounted on the subframe, you could probably leave it in place and just remove the guts so it's wide open internally. This should be pretty easy and easier than having to remove it and splice in a short section of tubing. I don't recall if the '67 has the barrel shaped hold off valve mounted just under the MC, but if it does and you're going to rear discs I suspect that should be removed.