[Shotimes] Front Rotor Warping

[Jim and Debbie Leyden]

I just went out and looked at all four corners.  The front pads are wearing
the rotors all the way to the perimeter of the rotor even though the
perimeter is less worn than the rest.  The rears leave about a 1/32" of
rotor that is untouched.

Jim
'93MTX


-----Original Message-----
From: shotimes-admin@autox.team.net
[mailto:shotimes-admin@autox.team.net]On Behalf Of Ian Fisher
Sent: Sunday, April 20, 2003 3:30 PM
To: Jim and Debbie Leyden
Cc: Paul Nimz; Shotimes@Autox.Team.Net
Subject: RE: [Shotimes] Front Rotor Warping


Doesn't FPS insist on using the incorrect pad size? Both 598 and (601?)
fit those calipers, but one has less swept area coverage. Are the rotors
wearing out to the edges or only a small cross section?

Ian


On Sun, 20 Apr 2003, Jim and Debbie Leyden wrote:

> I bought the OEM pads from FPS at the same time I put the first set of
> rotors on.  I drove the car carefully (using the brakes only lightly) for
> the first week.  Then I went out and performed the breakin procedure that
is
> outlined on that website.  I even went to the extreme of printing out the
> instructions and taking them in the car with me while I did the breakin.
At
> no time did (or do)I EVER sit in traffic with hot brakes and keep the
brakes
> applied hard. (if the car will sit at a light in neutral without rolling
> that is what I do.  If it won't, I will let it slowly creep with the
brakes
> barely applied so the pads can't burn to the rotor)  I have inspected the
> rotors visually and I can see no evidence of friction material transfer on
> the rotors.
>
> Like I said...  we have been extremly careful with this set of rotors to
not
> mess them up.
>
> Another thing that is bothering me is the act of having the rotors turned
by
> a service center.  Being a former machine tool builder I understand all
> facets of manufacturing processes and I firmly believe that the act of
> turning a rotor is destructive to the friction surface.  I would like to
get
> them Blanchard ground using the hubs mating surface for the baseline but I
> have no clue as to where I could find a machine shop around the Atlanta
area
> that could tackle this.
>
> Jim
> '93 MTX
>
>
>
> -----Original Message-----
> From: Paul Nimz [mailto:pmnimz@V8SHO.com]
> Sent: Saturday, April 19, 2003 3:47 PM
> To: Jim and Debbie Leyden; Shotimes@Autox.Team.Net
> Subject: Re: [Shotimes] Front Rotor Warping
>
>
> What kind of pads do you use?  Do you seat the pads after a 100 miles?
Read
> this for a controversial opinion.
> http://www.stoptech.com/whitepapers/warped_rotors_myth.htm  FWIW on my '97
> with the OEM rotors and 90k they didn't warp.  And now with AZ rotors
still
> no problem.  I have only used the OEM pads and am very pleased with them.
>
> Paul Nimz
> '97 TR SHO
> '93 EG mtx SHO
>
>
> ----- Original Message -----
> From: "Jim and Debbie Leyden" <jndleyden@mindspring.com>
> To: "Shotimes@Autox.Team.Net" <shotimes@autox.team.net>
> Sent: Saturday, April 19, 2003 1:08 PM
> Subject: [Shotimes] Front Rotor Warping
>
>
> > A little over a year ago I upgraded my brakes to the 11.6 front rotors.
> > When I did the conversion I used new pads, rotors, brackets, slider
pins,
> > calipers and backing plates.  The knuckles were purchased from a
boneyard.
> > About six months ago the car started to vibrate when braking.  I checked
> the
> > front rotors and found that there were casting porosities in them.  I
> talked
> > to the place where I purchased them and they agreed to credit me the
cost
> > towards a set of PowerSlot rotors.  Well, now six months later I again
> have
> > a nasty vibration from the front end when braking.  My wife and I have
> been
> > VERY careful with these brakes so as to not overheat them. (I DO drive
> > rather hard but I use engine braking as well as brakes)  I talked to the
> > shop where I purchased them and was told that the same situation had
> arisen
> > with the owners car (powerslots also) and he merely had to take them out
> and
> > REALLY heat them up to correct the problem.  I tried this, it seemed to
> work
> > for a little while (couple weeks they were fine) but now the shaking is
> back
> > and even worse then before.
> >
> > Any clues as to why I can't keep a set of rotors from warping?
> >
> > Jim
> > '93 MTX
> > perfect for that commercial where the guy is shaking his chocolate milk.
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