What do I need to do to reset the caliper on rear brakes

Hello, I'm Danny.

Here is the information you requested. Here is a guide to help you step by step with instructions in the diagrams below to show you how perform the repairs on your car:

https://www.2carpros.com/articles/how-to-replace-rear-brake-pads-and-rotors

Here is a YouTube video from our site on how to compress the rear caliper piston when performing a rear brake job as you asked:

https://youtu.be/j8YwfSKEzZo

I've attached picture steps below on how to replace the brake pads on your on your car and it shows what special tools are needed to perform this repair. Hope this helps and thanks for using 2CarPros.