rear brake issues!!!!!!!!

[glatf70gg]

the last 2 times i have gone riding, i'll ride for an hour or so, then all of a sudden my rear brake starts to lock up. If I let it sit for awhile, it cools down and loosens up. I have changed the brake fluid, and it still does it. You guys think synthetic fluid will help. i checked and the caliper doesn't to seem to be hanging up. It really happens when i get done practicing wheelies. Any help would be great. Thanx.

[bwamos]

Make sure your disk isn't warped. If it gets hot it could warp more causing the extra drag.

Just the first thing that came to my mind.

[beaubs]

yeah, that's a good start and if the rotor is fine, pull your calipor off the bike and clean it up. are you pins and bolts rust?

[markvette]

i had this happen to my sons 300. it was the master cylinder. it was full of rust and dirt. i took it a part and cleaned it real good and solved the problem.

Mark