I had a situation where, after hitting the brakes hard, they would lock on. The only way to release them was to move the bike in reverse. This was dangerous, for example, if I had to stop suddenly in the middle of an intersection. I suspect it might be a design fault with those particular calipers.
I replaced calipers and pads.
On my bike, everything to do with the gears is Shimano. The brakes may or may not have been Shimano.
Last edited by alo; 04-19-20 at 03:39 PM.