I have an issue with a Grizzly 450 and its confusing the F out of me. Using the front brake only the thing stops fine, the front right wheel doesn't lock up but it stops square, when using just the rears or the front and rears combined it turns to the left violently. Anything more than 10 Mph it will turn a full 90 degrees and tries to roll, clearly my first thought was that the back right brake wasn't working but the rear breaking is done in the Diff so should act evenly on both wheel stations. Anyone got any ideas???