So I have a 07 trx250ex my front brakes suddenly locked while I was riding it. Could it be the brake caliper getting stuck? Tried bleeding it when I got home and the front tires wouldn’t spin
Jack the front end up, remove the wheel/tire and try spinning the hub. Once there at the hub, I suspect you will quickly see the problem and likely as you mentioned, the piston within the caliber is stuck. If you are going to rebuild the caliber, I would suggest just doing both on the front, because the miles/hours, etc., are similar for both front wheels.