[Fot] Caliper questions

[Terry Stetler]

OK, now that you guys are getting rid of your Toyota calipers, I have a
question.  Will they work on a TR3 street car?  My 3 is still equipped with
the original type calipers, that resemble boat anchors to a great degree.
(Heavy they are, yes...).  What is needed to install the modern caliper on my
car?

Terry Stetler...
  ----- Original Message -----
  From: Gt6steve at aol.com<mailto:Gt6steve at aol.com>
  To: vinttr4 at geneseo.net<mailto:vinttr4 at geneseo.net> ;
fot at autox.team.net<mailto:fot at autox.team.net>
  Sent: Thursday, January 11, 2007 1:12 PM
  Subject: Re: [Fot] Caliper questions


  Hello Jack, I can take a stab at these questions as the GT6 uses the same
  ones.
  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?
  The Metric (late?) caliper uses a readily available pad as the dimensions
  match that of a 240Z.  Keep that a secret just between us though.  And the
500 or
  so FOTer's reading this.


  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?
  I've left the dust covers off for about fifteen years now with no apparent
  issue.  They are just too much aggravation to put on.  That said, we don't
race
  in the rain as often as you folks might.


  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?
  The only trick is to be sure the square O-ring is thick enough for
  reassembly.  They often aren't.  Then just retorque the bolts to an upper
range figure
  for the size.  Again, no apparent problem.


  As ever, thanks in advance.



  uncle jack
  Hope that helps, Steve
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