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Calipers can be rebuilt but if the pistons are scored caliper will require replacement
Caliper pistons should retract if calipers are in working order. Calipers need to be removed and rebuilt or replaced. A brake fluid flush is highly recommended.
that depends if it is front or rear calipers
Unlike the front calipers, pistons in the rear usually have to be rotated to compress them.
No need to rotate the front caliper pistons as you compress the front calipers. That process is only for the rear calipers because of the parking brake mechanism.
rear brake pistons are called actuated pistons. And the twist in and out. You will need a special tool to twist them back into the caliper. Unlike the Front Pistons which can be pushed back.
I just did mine. Use a screw driver to press the brake pads away from the rotor and compress the caliper pistons back some so you can remove the caliper off of hte rotor. Losen and remove the bolts to the brake caliper. DO NOT DISCONNECT the brake line from the caliper! Get you a c-clamp and a piece of 1/4 board about 4 inches long. Once you have removed the caliper from the mount and removed the brake pads support the caliper with one hand. Place the wood over the caliper pistons and using the c-clamp place it over the wood and center of both pistons and other side of caliper to compress the pistons back into the caliper. Make sure you DO NOT PINCH the rubber boots on the pistons. Once you have compressed the pistons back into the calipers install your new pads and calipers back on the mounting surface and tighten the bolts back to torque specs.
Depending on the make/model/year of vehicle, you may have to get a rear caliper tool. Some rear calipers need to be turned to retract them.
remove th front wheel, undo the 2 bolts on calipers and bushings,thenlift calipers off. HINT: if calipers seem to stick then get a large flat bladed screwdriver and wedge it between rotor and caliper and apply just enough force to back off pistons in calipers to remove them then they will slide off.
The calipers should turn back in with a big scredriver or such! you have to rotate the piston to retract them rotae the pistons clockwise with a large pair of pliers
there is a special tool that can be purchased at any auto parts store made specifically for compressing brake caliper pistons. I personally use a 4 inch c-clamp. works every time.
there is a special tool that can be purchased at any auto parts store made specifically for compressing brake caliper pistons. I personally use a 4 inch c-clamp. works every time.