A couple of days ago I expressed my frustrations with the trailer brake manufacturing industry for their inability to make a trailer brake that would last longer than it takes to get them home. Well after assembling all the parts and fluids that I would need to do the job, I tore into it this morning. I discovered what caused my brake to lock up on me and fry everything. A cigarette filter got kicked up by the tire I assume and got lodged behind the pad on the piston side stopping the pad from retracting. Guess I owe the brake manufacturer an apology and vent at smokers instead.