[200q20v] Re: Brake clamping forces

Bernie Benz b.m.benz at prodigy.net
Tue Jul 3 23:55:31 EDT 2001

If cost were not a significant factor, but weight was highly so, one would
tend to use the more costly, higher strength to weight ratio materials.  A
caliper design that is split down the center line allows free access to the
machining of cylinder bores in each half. and the two caliper halves can be
designed to be the same part, leading to a dual sided caliper.  The ability
to rigidly mount the dual sided caliper may further realize weight savings.

If the pad contact area is to be long relative to its height, maximum piston
area is achieved by multiple smaller diameter pistons.  The UFO pad is
almost as tall as it is long, so a single piston is the optimum
configuration for that pad.

I did not say that there were no differences between single and dual sided
calipers, just that there is no difference in clamping force for the same
piston area per side.


> From: "TM" <t44tq at mindspring.com>
> Date: Tue, 3 Jul 2001 20:45:29 -0400
> To: "Bernie Benz" <b.m.benz at prodigy.net>, <QSHIPQ at aol.com>
> Cc: "200q20V mailing list" <200q20v at audifans.com>
> Subject: RE: [200q20v] Re: Brake clamping forces
> Bernie,
> Can you clarify something for me? Why do pretty much
> all high-performance brake systems use dual-sided calipers
> if there isn't much of a difference? Why do they use so
> many pistons?
> All of the high-end racing applications use dual-sided calipers
> with many pistons- sometimes even 6 or 8 pistons, with the
> extreme being the 12 piston Alcon system.
> Taka

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