Help Me With My Brakes

I use one of the old pads placed against the piston and a large c-clamp to push the piston back into the caliper's bore, it's very easy to do.. No need for anything else. Just make sure you have the cap of the master cylinder removed when you push the piston back in and drain pan or a piece of cardboard underneath to catch the fluid. I have an 87 and believe it is the same as your 91. It is very easy.
I hope you are also replacing the hardware too. The wedges shouldn't be reused.
It would also be beneficial to rough up the rotors with some emory cloth if you are reusing them before installing the pads.
Been doing it the same way for well over 50 years !!
 
First, I remove some brake fluid from the reservoir. Then I shove a large blade screwdriver down between the pad and the rotor. The tip of the screwdriver is located next to the hub. Then I press the screwdriver against the pad.
 
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