i have a hope trials disk on one of me bike and they take 3days to properly wear the pads in and one you have done that they lock on! that sharp that if your not carefull it throws you forward! im currently building a 26" and ive bought the GREEN HS33s and im getting green zoo pads and my mate runs hs33s and hes had no problems and even when he snapped the hose near the actual brake they sent a new one within a week! magura rule on customer service and they reply to your e-mails with in a day! jason www.peterborough-trials.piczo.com firestarter8790@hotmail.com