During a jolly around Wales I experienced a loss of rear brake while descending the Elan Valley dams, nothing major just worrying, it returned by Crossgates and all was well. BUT after it had stood outside for a day or so, I went to move it and found both brakes were binding to such an extent the bike would hardly move, had to release the back brake by prizing the pads apart. Bikes done 80,000 miles and is in fair condition. On the bench yesterday and found the front calipers pistons ceramic seal was broken open on both pistons. Anyone any thoughts, have yet to dismantle the rear caliper as the rear wheel has to come out.