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If I am correct these are a parking brake caliper?
The pistons are threaded internally and have recesses in there face for a tool to grab and twist them in.
I generally use a syringe with ATF to lubricate the piston, you can lift the dust seal to get a bit of lube in there also.
You can make a tool, buy one or use long nose pliers.

But please do not use a C clamp.


Hmmm when examining mine recently I saw that it doesn't have a caliper for the parking brake as it uses the standard drum brake for parking brake duties. I just assumed he did some kind of disk brake conversion on his such as swapping in an axle from a Gen II or something.