Help! Rear brakes sticking, what's this piece on the rear caliper?

[Cooper]

When you replaced the pads did you push the piston back onto caliper?

[BATOYGIO]

I believe so, with a flat piece of wood and a clamp. Should I not have?

[-Ray-]

I believe so, with a flat piece of wood and a clamp. Should I not have?

No, you did the right thing. If you don't push it back the pads could be very difficult to get over the rotors.

[Cooper]

I really think you just need to flush your brake fluid and bleed your brakes.

[BATOYGIO]

Greasing those metal tabs that the pads slide into seemed to have worked, there was a lot of dust on those metal tabs and I couldn't smoothly slide the pads along them with the caliper off. Cleaned them and greased them to the point where I could slide the pad easily back and forth and it seems to have worked so far. Thanks for the help everyone!