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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: rear brakes locking b4 fronts
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Sat, 17 July 2004 04:39
 
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the reason backs lock up is because of the balance as other have said..
in hard braking, the weight transfer to the front of the car means that the fronts may be doing 70-80% of braking, and the rears only 30-20%.
this means that the disc x force of the rear brakes only needs to be (30/70) to (20/80), ie 25% to 43% of the disc size x force of the front brakes...
you can do a bit of math to work it out...
basically, work it out for one side.
disc size = either radius or diamter of the point of contact of the MIDDLE of the pad.
force = area of piston. (well, proportional to)
now do
(disc size) x (force) = Braking Force
(for want of better terms), for both front and rear disc..
then do the ratio BF(front) : BF(rear)
with proportioning valves, do they just reduce the flow of the brake fluid? or do they seperate the front and rear flow completely?
if the fluid line is continuous (even with a restrictor), when fluid flow stops, then the whole fluid system will have equal pressure, so i'm assuming that the proportioning valve decreases the flow initially to the rear, so that the rears don't lock up initially, as weight is transferred forward, and then when the car has balanced, more pressure is available to rear brakes?
anyways, Wilwood do a couple of bias adjusters which are pretty near. one has steps and the other is continuous adjustment..
and in cabin adjust is definitely not legal, but engine bay might be if your engineer says so...
anyhoo...
Cya, Stewart
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