4 piston calipers question

MoparMike1974 said

I made a fitting with a brake hose and grease fitting to pump grease in to remove pistons. For the 4 piston caliper you will have to put clamps on the ones that are moving so the pressure can go to the other one.
I also recommend filling with brake fluid or water to minimize the amount of grease required.

Compressed air only works if the pistons are not stuck. When they are stuck you need hydraulic pressure.

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I agree with the above although I didn't worry about getting grease in the caliper. It wasn't hard to clean. Compressed air was a waste of time because I had a few badly stuck pistons. I believe the grease gun had 1/8 NPT fitting so you need to figure out an adaptor. The video shows how to use wood blocks to prevent the pistons from coming out of the bores. You will need an assortment. You never want any of the pistons to come out until they are all free (especially if you have compressed air applied).

I believe this is the video I followed