[DeTomaso] rear brake options?

[Ken Green]

Front calipers generally have larger pistons to provide greater braking, so generally, you don't want to use front calipers on the back, or you may have to excessively restrict the flow to the rear calipers.  We did a back of the envelope analysis a while back and I think we concluded that the weight distribution shifts from 40/60 to about 60/40 under 1 G braking.  So with a single tandem master cylinder you'd want the rear pistons to be 2/3s the area of the front (or less) to avoid locking up the rear wheels first.  We compared this estimate to the areas of Porsche 996 turbo (has about the same 40/60 weight dist) caliper pistons and it came out very close.  
 
I don't know if there are stepped brake master cylinders?
 
Ken

--- On Wed, 3/24/10, Rob Dumoulin <rob at dumoulins.net> wrote:


From: Rob Dumoulin <rob at dumoulins.net>
Subject: Re: [DeTomaso] rear brake options?
To: pantdino at aol.com
Cc: detomaso at realbig.com
Date: Wednesday, March 24, 2010, 10:03 AM


About a year ago, I installed a Brembo Grand Turismo big brake kit on my
350Z.  A friend of mine that has a auto repair shop saw my stock Pantera
rear calipers. and suggested I put my old stock 350Z front calipers on the
Pantera rears.  I'm confident they are superior to the stock Pantera ones,
maybe too good.  Anybody done retrofits with other applications?

On Wed, Mar 24, 2010 at 12:20 PM, <pantdino at aol.com> wrote:

>
>
> Sounds like the stock rear brakes on a Pantera are too small.
> Putting in a pressure control valve just limits the fronts so they don't
> lock up too soon
>
> Have people put a different kind of caliper on the "extra" mounting points
> and kept the stock one for the hand brake?
>
> I see Wilwood calipers are actually pretty cheap (($125 for the caliper
> itself).  Would that make sense?  I haven't paid much attention to those
> because I believe they don't have dust seals at the pistons.
>
> I'm afraid to even ask Steve Wilkinson if stock rear calipers (to replace
> my frozen "extra" ones) are available and how much they cost. But I guess
> I'll summon the courage.
>
> Jim
>
>
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-- 
Rob DuMoulin
904.476.8744
rob at dumoulins.net
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