you need to use a rear brake caliper piston turning tool... you can't use the push method... the piston have to be turned as they screw out as the pads wear. i found out the hard way.. i broke 2 c-clamps...
If the car has drum brakes take the tire off and on the back of the hub at the bottom there is a small slit (it may have a rubber bootin it) take the boot out. inside ther is a small gear with teeth...
Typically, you take one of the pads that you removed, place it on the piston and use a large clamp to compress it back it. Some vehicle have pistons that screw in.
Answer.
Most autoparts stores...
The vehicle has to be off the ground preferably on a lift I used two pieces of wire under the hood to hold the radiator in place so it would not drop down suddenly. There is a metal bracket running...