Re: UFO brakes "warping"

["Anthony K.B. Chan" <chan@seattleu.edu>]

On 9 Jan 1997, Joseph Yakubik wrote:

> 
> My personal opinion on the "warping" is that it doesn't warp.  When I removed
> the old discs I had "imprints" or "shadows" from the old pads in the discs.  I
> think that if the rotors get too hot and you leave the pads in contact too long
> some pad material "bonds" to the rotors.  Your brakes will then grab or feel
> like a shimmy when the pads come in contact with the "bonded" section.  This
> also jives with the "don't park or stand on the brake with hot brakes" and "a
> few 80 mph to zero stops make the warping go away".
> 
> How to fix this problem:  dunno, better rotors (cooling, less porous alloy?) or
> better pads (higher temps?).
> 
> Joe Yakubik
> 
> 

They really do warp. What you said was partially right. It warped because 
the section of the rotor that was grabbed by the rotor wasn't cooling at 
the same rate as the rest of the rotor. The rest of the rotor is cooling 
down but the section of the rotor under the brake pads is not as well as 
it's getting a continuous source of heat from the brake pads.

Anthony Chan, First Hill, Seattle, WA, USA.
chan@seattleu.edu
92' 100 V6 Tornado Red.