New to the site having trouble finding link to my brake problem . I just bought a 2008 Yamaha YZ450F and the brakes lock up . They locked up on the test ride witch was almost very bad ,but i save it :banana:lol I released the pressure and when the bike cooled down the bakes seem to work fine. On my next test ride i was careful not to touch the front brakes and with in a mile with not touching the brakes they locked up and i had to release the pressure .Iv pulled the calipers off and have the calipers apart doing a complete rebuild but should i be looking at the master as well . I guess im wounder if anyone knows whats causes this . I thought maybe water but from what iv read water dose the opposite and makes your brakes fail ?