Odyknuck wrote:
Yes it does sound wierd. How does installing a valve in the rear make the fronts less active?
Because it allows you to setup a car that is biased to the rear for the really muddy stuff, but then slowly pushes bias to the front as you brake harder and harder when you find more grip.
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Ok, but I will be hard on them as soon as I drop off the crest of a steep hill so my front brakes will lock up in short order.
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The way the proportioning valve works is quite similar to the blowoff in a digressive damper setup, or even a high-flow Fox/King with a standard stack, there's a point where the force vs pedal pressure curve knees over and becomes less steep, which then steadily shuffles brake balance to the other end of the car the heavier you brake, however, the initial curve is still as steep as normal until the valve cracks, so by putting the valve in the rear of the car you can then set the rest of the brakes up so the rears still lock before the fronts on the slippiest stuff you can find, but because the valve will crack open and slowly reduce rear line pressure vs pedal pressure, it shuffles the brakes to the front when you find either more grip, or when you have more weight over the front.
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Good info however my above statement still applys
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That helps massively with not locking the tyres up as it allows the fronts to have lower initial braking force whilst the weight transfers onto them, then ramps up the pressure to match.
With the valve in the front, it'll tend to snatch at the fronts as you first touch the brakes and make them lock, then reduces the pressure after that, which doesn't help when they're already locked, just makes them hard to modulate
Based on my experience with front porportioning valve control you are exactly right. My fronts lock up as soon as I use my brakes aggressivley. Hense the reason I have seperated them. I will say had I known what you are telling me before I did it I would have definatly tryed doing the PV on the rear. It would have only taken a few plumbing changes. Oh well too late.