Is it mechanically harmful to disable ABS (for the track only)?
If not, how can I disable ABS, just pull a fuse?

 

yeah or just screw it up a few days before like I did, still haven't figured out the deal... will tell you that it made the braking a lot different, but helped me learn the threshold of locking them up(which I did a few times)

 

Yea you can pull a fuse, or pull the parking brake up a notch, drive around for a couple mins and it will cut off.. I highly recomend not doing this on the track though, ABS can save your *** sometimes, and remember, its driving school, you don't have to worry about getting that extra tenth of a second