I have too much rear brake bias.
Has anyone ever installed a brake proportioning valve?
What did you use?
where did you install it?
What advice, parts, sources do you recommend?
thanks
Brake proportioning valve install
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73notch
- Posts: 711
- Joined: Wed Jan 29, 2003 12:01 am
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Victor H
- Posts: 252
- Joined: Tue Apr 03, 2001 1:01 am
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Victor H
- Posts: 252
- Joined: Tue Apr 03, 2001 1:01 am
Yes, the lever type is much more expensive. However, here's the plus:
1) Only 8 settings so easier to find the "right" adjustment
2) If it gets bumped easy to find the right adjustment again.
3) Easier to adjust while driving the car especially if you go too far and need to go back to the previous setting. And, under some conditions you might want to change brake bias and then back (different traction conditioins)
4) Dial / screw type is perfectly fine, but harder to find the same setting without brake pressure gauges.
Something I didn't know is that at low brake line pressures the differential from front to back is 1:1 (i.e. no differential).
However, once you find a setting you like it works this way.
For example: Say you set the proportioning valve at 400 psi (you don'[t know the psi setting, but this is how it works). Below 400 psi front and rear brake line pressures are the same.
Above 400 psi, the ratio then changes to 3:1. That is for every 3 psi the front brake pressure goes up, the rears go up by one psi.
I've played with it and it works great and was exactly what I needed. My guess is that most people don't need this especially with stock brakes but on my set up with big single pistons in back and 4 small pistons up front per caliper, I had way too much rear brake bias. hope that helps with understanding how these things work.
1) Only 8 settings so easier to find the "right" adjustment
2) If it gets bumped easy to find the right adjustment again.
3) Easier to adjust while driving the car especially if you go too far and need to go back to the previous setting. And, under some conditions you might want to change brake bias and then back (different traction conditioins)
4) Dial / screw type is perfectly fine, but harder to find the same setting without brake pressure gauges.
Something I didn't know is that at low brake line pressures the differential from front to back is 1:1 (i.e. no differential).
However, once you find a setting you like it works this way.
For example: Say you set the proportioning valve at 400 psi (you don'[t know the psi setting, but this is how it works). Below 400 psi front and rear brake line pressures are the same.
Above 400 psi, the ratio then changes to 3:1. That is for every 3 psi the front brake pressure goes up, the rears go up by one psi.
I've played with it and it works great and was exactly what I needed. My guess is that most people don't need this especially with stock brakes but on my set up with big single pistons in back and 4 small pistons up front per caliper, I had way too much rear brake bias. hope that helps with understanding how these things work.