dc2000

Hi, I have a 2010 Carrera S with Michelin Pilot Super Sport tires (245/35/19 in front, 295/30/19 rear). This has been my first autocross season. I've been experience partial brake lock up when I stab the brakes going into a turn; PSM is off. The tires will squeal a bit before getting grip. I'd expect the ABS to kick-in much sooner, but it doesn't. After my autocross session yesterday, I slammed the brakes leaving the track and the tires locked up initially. Later, I was driving home and decided to test the brakes. With PSM on and off, ABS kicked in just fine and I didn't get any tire slippage. I could continue rolling onto the brakes, which prevents the front tires from locking up, but this obviously takes more time to slow down. Has anyone experienced this or know what could be the cause?

user 72902

I know that you know that ABS cannot be turned off. PSM would have no affect on your brakes so my guess would be that you have some kind of fault in your ABS system.

cosm3os

Sounds normal. You'll get some chirpping as tires get loaded/unloaded in quick transitions.

too tall

Long shot. I'm not convinced your rotors and pads are working well together. If the car has been sitting than it is a good call to go someplace safe and do a few hard accelerations and had stops. Do three one after the other to get the brakes good and hot than drive ten mins. easy to cool them off and test to see if that improved the brake performance.