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So, I replaced my rear brake pads, put brake lube on the pads, and anti-seized the free floating pins. The result was good in the braking portion. However, the left rear caliper makes a crazy annoying noise when the brakes have heated up. As I drive on freeways speed long enough, it gets even worse. It sounds like scraping in a way, but more like a very consistent rubbing vibration where at an speed, the rubbing happens at the exact precise moment and only gets extremely loud when applying the brakes. If the brakes are cold, there is absolutely no sound even under pressure. I took off the caliper a few times and could only notice one thing;

-there is a slight gap between the pads because of having to turn in the caliper. I dont understand how the pressure is applied cause you screw in the rear piston when you want to move it in or out. Also, there is a groove on the brake so, how does the piston move out more???

The gap, is only visible on the upper claw holding the pad on (outer pad).

The noise is annoying.

how are the rotors??? New??

This pads should adjust to their own clearance from teh rotor. If there is air between the pad and rotor, something is wrong.

How are the dust sheilds?

If the rotors are worn your pads might just be working into the shape of the rotor, and you're killing them faster...

Always best to resurface rotors if they're bad, or just get new ones.

Sounds like a dust shield scraping on the rotor. I've had it. It's awful.

found out it was a rotor. HAHA! geees! I thought that 1 year old rear rotors, i could do without cause they are on the rear but i guess they need milling or replacing regardless