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Old Feb 22, 2007 | 02:02 PM
  #21  
Arkmage's Avatar
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Originally Posted by y8s
pads are easier

i'll forget what i've heard about bias valves and just ask: at steady state (brakes on hard) doesn't the system pressure equalize and you're back where you started? Or is it a matter of less fluid flowing to the rear means less braking on that end because the pistons aren't moving as far?

and ultimately, isn't the weight transfer the same? if my deceleration rate is the same, physics takes over and the car rotates around the CG just as before.

ideally I just want the fronts to reach their threshold before the rears.
your ultimate braking will be roughly the same yes (a little different because of the pressure drop across the restriction). the idea is that it takes some of the "bite" out of the rear to prevent the lock up and *** happy situation. Think of the pressure curve at your calipers as the "braking force curve". This would make it less linear, but it would still end up at the same place in the end. The only way to get true bias control is with a dual master cylinder setup and a proportioning bar.
Old Feb 22, 2007 | 02:18 PM
  #22  
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y8s
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Originally Posted by Arkmage
your ultimate braking will be roughly the same yes (a little different because of the pressure drop across the restriction). the idea is that it takes some of the "bite" out of the rear to prevent the lock up and *** happy situation. Think of the pressure curve at your calipers as the "braking force curve". This would make it less linear, but it would still end up at the same place in the end. The only way to get true bias control is with a dual master cylinder setup and a proportioning bar.
it's been a while but the problem was generally late in the braking zone. realistically I'll never go to the trouble of doing all the work on a daily driver but pads I swap out at the track anyway. I've heard good results from moving from Wilwood's D or E to B or A to help this...
Old Feb 22, 2007 | 06:32 PM
  #23  
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Originally Posted by y8s
it's been a while but the problem was generally late in the braking zone. realistically I'll never go to the trouble of doing all the work on a daily driver but pads I swap out at the track anyway. I've heard good results from moving from Wilwood's D or E to B or A to help this...
sounds good... I'm in the market for new pads soon (got about 500 miles left before hitting the rotor metal on metal) but I think I'm going to stick with my axis ultimates. They do the job very well for streetable pads and are inexpensive.
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