[DeTomaso] removing second set of stock rear brake calipers?

[Tomas Gunnarsson]

The stock prop valve is there to prevent premature front wheel lockup. With
dual rears it may not be necessary. If you remove the extra set the valve
should go in again. That said, the dual calipers are not likely the cause of
your drag. I have dual calipers per side (one stock, one other) on my car
and the drag is not notably different from one caliper per side. Your drag
should go away with a general overhaul.

Tomas

-----Original Message-----
From: detomaso-bounces at realbig.com
[mailto:detomaso-bounces at realbig.com]On Behalf Of pantdino at aol.com
Sent: den 7 mars 2010 19:11
To: detomaso at realbig.com
Subject: [DeTomaso] removing second set of stock rear brake calipers?


When I got my car 20 yrs ago the PO had installed a second stock caliper on
each rear wheel. I suspect as a result the car has always had more brake pad
drag, evidenced by resistance to rotating the wheel by hand or pushing the
car. (The rotors are not warped-- the resistance is steady.)
I believe the cars came with a brake proportioning valve, which was removed
when the aftermarket (GM I think) master cylinder was installed. (Again, by
the PO). My understanding is that said proportioning valves are to prevent
rear wheel lockup.
I would like to remove the redundant rear calipers to eliminate the extra
drag, and my question is whether I have to reinstall a proportioning valve
if I do that.
 I am running 285/40-17 and front 215/45-17 front tires, Goodyear Eagle F1.
Looking at that puny rear pad I find it hard to believe that it will lock up
that wide tire before the larger front pads will lock up the much narrower
front tire.
So I'm thinking removing the extra rear caliper will not require a
proportioning valve.

I'll disassemble the calipers also to check their condition after 20 yrs of
silicone fluid use.

Jim Oddie


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