Rotor Warp

["Scott Johnson" <scott@domain.elided>]

From a Road and Track article, long long ago:

Rotors will warp because the portion the pads are gripping will cool off 
at a significantly different rate than rest of the rotor. This is 
especially pronounced if, for instance, you have to sit at a traffic 
light at the bottom of a very steep hill. They gave no formal solutions 
to the problem, but I imagine leaving your foot off the brake as much as 
possible would help.

Every disc-brake car I've ever driven in for any length of time has 
ended up with warped rotors to some degree, even very new cars like our 
PT Cruiser (01), and my brother's Pontiac Trans-Am (02). My own spider 
has very badly warped rotors... the vibration is extremely pronounced 
when I brake heavily from highway speeds. Another garage project for 
this winter...

Scott Johnson
Alfa Spider FAQ Author
71 Spider
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