Bryan;
If this is happening to new rotors, I'd take them back and complain
about this problem; it should not happen in so few miles.
Good quality rotors should not distort or heat-spot in 800 miles! Make
sure your caliper pistons are not sticking before raising a ruckus with
Raybestos about the rotors, though.
Check out : http://www.babcox.com/editorial/bf/bf10312.htm
Here is part of what it says:
"Rotors can also develop hard spots that contribute to pedal pulsations
and variations in thickness. Hard spots may be the result of poor
quality castings or from excessive heat that causes changes in the
metallurgy of the rotors. A sticky caliper or dragging brake may make
the rotor run hot and increase the risk of hard spots forming. Hard
spots can often be seen as discolored patches on the face of the rotor.
Resurfacing the rotor is only a temporary fix because the hard spot
usually extends well below the surface and usually returns as a pedal
pulsation within a few thousand miles. That's why most brake experts
replace rotors that have developed hard spots."
Regards, Neil Tucson, AZ
-----Original Message-----
From: owner-land-speed@autox.team.net
[mailto:owner-land-speed@autox.team.net] On Behalf Of Bryan Savage
Sent: Wednesday, June 02, 2004 9:44 AM
To: List Land Speed
Subject: RE: Strange looking brake rotors - help. (NON LSR)
Glenn, David, Ron, Jonathan, Doc and Neil,
Thanks for the information. I thought that's what it might be because I
did that
to a rotor with a greasy finger many years ago. But it was obvious it
was a
finger print.
When I saw the rotors during a routine 30,000 mile service, I ordered
new
rotors and pads (Raybestos). The Raybestos rotors appear to come from
the same mold as the OEM rotors.
Soooo ... was the OEM rotor susceptible to this problem because it was
cast
out of a sub-optimal alloy (old iron Woks from Japan?) or ?????????
(I know that the racing setup is two piece, hat & rotor, for a number
reasons.)
I don't have enough miles (800) on the new parts to determine anything
yet.
With all the front wheel drive stuff there is very little room for air,
much less
a hose larger than about, maybe, one inch.
Two questions:
1) Would grooving the rotors help?
2) Would larger calipers & pads help?
Establishing V max = 35MPH is NOT an option Keith!
Thanks again for your help,
Bryan
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