To get the piston back into the caliper you will have to use a special tool.
You will have to use the tool and line it up with the slots on the piston and turn the handle of the tool. This will allow the piston to go back into the housing.
Here is a helpful video:
I have attached the replacement procedure below.
Please let me know of any questions.
Images (Click to enlarge)
Friday, October 8th, 2021 AT 1:52 PM