Never have understood that business about not splitting the calipers, except
that the o-rings were hard to get and sometimes too skinny. I've made them out
of O-ring universal material (the kind where you glue the ends of neoprene or
viton string together) and it's worked fine, nice to hear they are available
though.
Would you're club go sideways about non-stock period replacement calipers like
APs? It's nice to have lightweight calipers and I've seen advertisements for
these being produced again. In general they are a bolt on replacement if you
get the right ones. They look identical to standard Girlings.
-----Original Message-----
From: fot-bounces@autox.team.net on behalf of Jack W. Drews
Sent: Thu 1/11/2007 9:33 AM
To: fot@autox.team.net
Subject: [Fot] Caliper questions
I race a TR4 with Toyota calipers. I love them not because they give
me much of a braking advantage but because the rubber parts are made
of modern stuff and last more than a partial season. With stock
calipers, I've always roasted the dust covers in two weekends and had
to replace the sealing rings every season. However, my club is
working to bring cars back to era correctness and wants me to switch
back to the stock calipers.
I have found a set of TR6 calipers that I would like to use. They are
dimensionally identical to the TR4's but vary in some details, and I
can't find any TR4's.
I'd like some input from the collective wisdom of the FOT:
1. Question about calipers -- Are there any major advantages /
disadvantages, TR4 or early TR6?
2. Question about pistons -- My new calipers have the 1/4" pad
retaining pins and are marked 16P, which means that they are the
early TR6 calipers. However, they are fitted with the late dust
covers with the extra spring retaining clip. Since I must buy new
pistons, does anybody know the difference between the early and late pistons?
3. Dust cover question -- the last time I rebuilt stock TR4 calipers,
when I tried to install the dust covers, I gave up after a couple of
hours and assumed that they were made wrong, with a lip too big for
the slot. Do others have this problem? If so, have you seen a
downside to leaving the dust covers off?
4. I fully expect the bores to be totally corroded, so of course I'll
have to split the calipers to clean them up. The manual says don't do
it, but I don think I'll have a choice, and the o-ring is available
from Moss. Is there anything really tricky about splitting the calipers?
As ever, thanks in advance.
uncle jack
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