Really struggling with these brakes now. Just installed new pads, but pistons won't separate far enough to put the wheels back in. Tried pushing the piston in using a plastic tyre remover, but no joy. It seems like one pad (hub side in both cases, front and back) is a lot further out that the other, which suggests sticky pads.
I'm also a bit confused as the pistons move (both pistons on both brakes) as soon as the actuator arm starts moving. I thought they were supposed to have a delay as a valve closed, so I'm wondering if they're actually properly set up at all. I can't see where the bleed valve is though, and if it's opening.
Any advice gratefully received!
Edit; I think there's three problems I'm working on here; i.) The pads are asymmetric; the outside pads are barely showing, the inside ones are protruding by about 2-3mm. ii.) Even with the cable detached and the arms locked out I can't push the protruding pad in. It moves slightly under extreme force, but moves back after the force is removed. iii.) The pads move as soon as the brake lever moves, which I don't think is right.
I'm going to try and clean the edges of the pistons I can get to, as following this you tube videoand see if that helps at all, will report back.