Re: [ST] Dreaded cupping

[Neil Lindsey <NeilLindsey@xxxxxxx>]

Bil,

since you've already replaced your rotors once, I assume that the replacments were
carefully checked when new .....

the only other cause for subsequent rotor warpage that I know of is HEAT, and I have a
feeling that kevlar pads runs particluarly hot (but wear slower)

I'd also suggest that the cupping of the front tire tread is symptomatic of relatively
heavy use of the front brake, notwithstanding the fact that Bridgestone tires seem to be
particularly susceptible to this phenomenon.

Neil


- ----- Original Message -----
From: "Bil Swartz" <bil@xxxxxxxxxx>
To: <st@xxxxxxxxxxxxxx>
Sent: October 13, 2004 1:37 PM
Subject: [ST] Dreaded cupping


>
> On return from the HSTA FOF event in Farmington, Mo. I noticed my front BT-020
> was showing the dreaded scalloping pattern already!  This tire is only a
> coupld of months old, mebbe somewhere around 2500 miles on it (gotta look at
> log).
>
> Have also noticed rotors need checked for warpage again, these rotors being
> the EBC's I replaced the OEM's with back around 15k, now at 40k.  I'm seeing
> the mirrors "dance" when braking at speed, as well as feeling that "grab/slip
> pulse" kind of thing during the last 3-4 mph of coming to a stop.  I have not
> measured with the dial gauge yet. Installed EBC green kevlar pads with the
> rotors, which BTW still have plenti-o-meatage on 'em.
>
> Tire pressure this trip was kept a pound or so higher than the usual 36psi.
> I'm thinking the cupping is related to the possible rotor warp.  So the
> question is what's causing this rotor warpage, assuming they are?
>
> Thoughts?
>
> Thanks all.
> --
>
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