I would be very careful about increasing the stopping power of the
rear brakes while not making a change to the front brakes. Too much
braking on the rear can cause the car to want to swap ends under
panic braking conditions. Ask any vintage TR racer.
I installed the Toyota 4-pot front brakes on my TR4 race car and ran
it that way for three years. For 2007, the sanctioning body I run
with made some rules changes and I had to remove those and go back to
TR brakes to make it "era correct". My experience is that there is
not much braking difference between the two setups. Although the
originator of this conversion did some braking tests, the differences
in stopping distances were really not very big.
Comparing the two calipers, the TR calipers are lighter (as if that
really mattered much). The piston area of the Toyota calipers is
larger, but the pad area is actually smaller than the TR brakes. So
you takes your choice in regards to what is the most important.
Nevertheless, I liked the Toyota parts better, solely on the basis of
higher quality replacement parts and longer intervals between having
to rebuild the calipers. I felt that their "feel" under maximum
braking was a little, but not much, better. Rebuild frequency isn't
an issue on the street and stock parts have worked just fine for
years on my street TR6, but on the race TR4 (virtually identical
brakes as the TR6), the heat from the front brakes cooks the rubber
parts in the front calipers. They become "well done" after three or
four races and require replacement, always a lot of fun.
At 05:09 PM 7/3/2007, Bob Danielson wrote:
>Bob Lang just tipped me off to an easy brake upgrade for a TR6. Just drop in
>Sunbeam Alpine (.750 bore) or Morgan (.875 bore) rear wheel cylinders and
>.......................
uncle jack
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