Not Warped Rotors?

[Sisuguy]

Not Warped Rotors... What Is It?

I have a 2000 Boxster S with factory rotors and pads. Have done several DEs with no issues. This weekend I experienced the followingIn the middle of day #2 the following started to happen:

When the brakes were hot and I was doing heavy breaking from high speeds (example breaking from ~ 115 mph the car felt like I was braking on a "washboard" surface, meaning that the car became a bit unstable and started to "wobble"

This was NOT the ABS, which feels different, I also did not have brake fading and I had pretty much the same brake distance as before, so the brakes generally still worked great. And it only happened after a few laps when the brakes were hot.

When the brakes are cold everything feels normal. I checked runout and have 0.001" or less on each rotor, no cracking or signs of any pad material buildup. Pads have at least 8mm of material left.

Ideas?..

[Loren]

No such thing as "warped rotors". Chances are your pads overheated and they have left deposits on the rotors (as well as ruined the pads).

You should really change to track pads for the track and street pads for the street.

 

You will likely need new pads and cleaning/light turning of the rotor discs.