Re: Re^2 RE: Disc Brake kits

["Smith, Kirby A" <kirby.a.smith@lmco.com>]

With respect to my previous message below, I want to note that I am aware
that there may be brake pad materials which will accomplish the same result
at lower cost.  Unfortunately, in spite of the List's past opinion data
base, I don't have a clear picture of different pads' comparative
performance, in terms of friction vs. temperature vs. dust produced vs.
lifetime.

kirby
__________________________________________________


> Yes, you are right, my choice of words was poor.  The swept area does not
> increase with this concept, and thus the heat dissipation does not
> improve.  However, the friction that can be applied in a single stop is
> doubled, as the disk is unlikely to overheat in that case.
> 
> kirby
> 
> ----------
> From:
> steveb@falcon.kla-tencor.com[SMTP:steveb@falcon.kla-tencor.com]
> Sent: 	Friday, May 22, 1998 6:23 PM
> To: 	kirby.a.smith@lmco.com
> Cc: 	quattro@coimbra.ans.net
> Subject: 	Re: Re^2 RE: Disc Brake kits
> 
>  # I've wondered that myself.  In particular, if one wanted to remain with
>  # 14-inch wheels, even the G60s would not work.  Has anyone evaluated the
>  # possibility of using a second pair of standard piston assemblies on the
>  # opposite side of the rotors?  This would double the swept area and keep
> the
>  # present wheel clearance.  I would expect one would need a mounting
> bracket
> 
> ... based on my understanding of braking theory, adding a second caliper
> on the same rotor actually would not increase the swept area.  The swept
> area is the area of the rotor that is actually contacted by the brake pads
> during each revolution of the rotor.  This means that the only way to
> increase swept area would be to increase the diameter of the rotor or make
> the "hat" section smaller.  
> 
> Perhaps you could use the internal caliper technique so despised by all
> (UFO's) or mount a rotor on the inboard end of the half shafts.  Both
> techniques were used by Audi on one car or another ... perhaps you can
> adapt one of them to your car ... ;-) 
> 
> Steve Buchholz
> San Jose, CA (USA)
> 
>