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oldcorollas
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Kita-Ku, Sapporo, Japan
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January 2003

Re: JZA80/R32 GTS brake conversion for A70's

Tue, 12 July 2005 06:34

V8_MA61 wrote on Tue, 12 July 2005 16:12

obviously the more pistons in the calliper the better its braking response though. Its gonna take a lot less time for 4 small pistons to move than it is for one big one.

if they have the same cross-sectional area (per side of caliper of course), the same amount of fluid will produce exactly the same result in terms of piston movement and force applied Wink

Edit: this is cos when the single piston has the same area as one side of the 4 pot caliper, the same volume of fluid produces same extension.... but with 4 pot, you have to double the amount of fluid as you have to take up pad knock on both sides of the non-floating caliper. but on a sliding caliper, only one side moves, but it has to take up the pad knockback from both sides, so it DOES move twice as far, but the total piston movement of each caliper, and the amount of fluid required to displace the pistons is EXACTLY the same....

so for equivalently sized 4 pot and single pot, the only difference should be the eveness of force application...

But, with a 4 pot, you also have more piston circumferential area = more friction from piston seals etc.... is this good or bad?

[Updated on: Tue, 12 July 2005 06:47]

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