Stu
I measured some of the pads I have and the total thickness of pad
and backer is around .60".
I just measured a caliper with the pistons all the way in at 1.94" - 1.20
for the pads and .5" for the rotor = .024".
Your pads are .010" bigger than the distance in the caliper; if you have an
anti-squeal shim in the caliper it is even worst.
I would say that you need to thin those new pads to around .60" to have some
clearance.
Ron Fraser
-----Original Message-----
From: tigers-bounces@autox.team.net [mailto:tigers-bounces@autox.team.net]
On Behalf Of Stu Brennan
Sent: Monday, June 27, 2011 8:46 PM
To: tigers@autox.team.net
Subject: [Tigers] Brakes 3
OK, here's how the weekend went with my brakes. Saturday morning I went for
another drive, checking the temperatures of the disks att he same points
little brake use. At about a mile and a half, I'm not sure how hot one disk
was, it was "off scale high" on my IR thermometer. The other was right
around 200F.
At home, I pulled the wheels again. The pads could easily be pushed back by
hand. OK, screwdriver, they were still a bit toasty. But when released,
they would pop right back against the disks, the outer boots on the pistons
pushing them back into position.
I reinstalled my old thinner pads, and they were fine, the pads would push
back and stay back. Repeating the test drive, things were fine, the disks
got a little warm, but stabilized well below boiling. I drove several
miles, again no overheating.
FYI, the new pads are about 0.617" thick, including the backing plates. The
old ones appear to have just over half the friction material thickness.
Sunday, driving into Brookline, just under an hour, again no problems. No
smoke and flames, or even bad smells when I got there.
So the conclusion is that my outer rubber seal on the caliper pistons do not
lay flat enough to allow new pads to be pushed back by the slight disk
wobble, and stay back far enough to not seriously rub the disks.
These boots came from VB, but before you say "See, you should have known
better!", I compared them to an unused set I got from Rick a bunch of years
back, but got lost in my spares until they were too old to use. They were
shaped about the same, Rick's not particularly flat, either.
Has anyone else had a problem with this, overheating disks after a brake
rebuild? Where did you get YOUR rubber bits for the calipers?
Stu
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