Squealing Rear Brakes Backing Up

[armcomdes]

My rear brakes are squealing up a storm while backing up (2007 ES350 - 120,000 miles). The pads are like new and I feel the fronts were doing all the work. I did a complete fluid replacement and that helped with the front to back, but  they are still squealing. I did have an issue many years ago with the rear passenger side caliper piston locking up, but I thought I had loosened it adequately.

My question is, if I replace the one caliper, should I just go ahead and do both? Also, do I go OEM, or what brand would you suggest?

[PHOTO]

check the pins on the calipers they may need to be greased, I had the same problem as yours and that did it for me. Good luck

[PHOTO]

I own a 2007 es350