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Most likely the brake hose to the caliper is bad. They deteriorate from the inside and clog up, not releasing the fluid. A way to check is raise that tire pump up the brakes, release the hose at the caliper, if the caliper releases, the hose is bad, if it doesn't the caliper is bad or you have no brake pads left and the piston can/is cocked a bit.
Normally I would say check the brake hose, but that would only be for one wheel. If the rear brakes are not releasing normally, either something is keeping pressure applied, or the calipers are not sliding back. If both inner and outer pads are wearing down equally on both wheels, I would look for a pressure problem. If only the outboard pads are wearing, the calipers are sticking in place.
the piston needs to be turned and pushed at the same time. There are several different tools for this.
This one works the best but is also more expensive.
This one is very cheap and may work. Personally not worth it to me.
These will lock into the slots in the piston. Then turn the piston while applying pressure. Because the E-brake is built into the caliper the piston has a mechanism that allows it to ratchet out. Turning the piston while pushing it in will release the ratchet mechanism and allow to piston to be pushed back into the caliper.
With the wheel removed, look behind the caliper there are 2 bolts that hold the caliper in place. Completely remove the lower bolt and loosen the top. The caliper will then swing upwards exposing the old pads. Remove cover off master cylider reservior. Leave both old pads in place for now. slide the far side pad over to the near side pad and using a channel-lock wrench, squeeze slowly and steadily. this will cause your brake cylider to retract, pushing the fluid backwards through the line and into the reservior. Once the cylinder is retracted, remove old pads and place new pads on either side. Align caliper and swing it down. Replace lower bolt and tighten upper.
It can be the wheel Hub bearings. The rotors if warped will wear out pads early. Bad calipers are another possibility as well as a bad Master cylinder.
If the Hub bearings are bad your tires will have cupping. If the tires are okay the rotors are warping from contact with the pads. The pads won't release if the calipers are jamming OR the Master Cylinder is keeping pressure to the calipers.
You can get a pressure check done on the Master cylinder to see if the pressure is releasing when your foot is off the brake. If the pressure is releasing then the calipers are probably sticking. Make sure to use new brake hardware and a lubricate for the hardware when you assemble the calipers.
I am assuming since you said "pads" you are reffering to disc brakes. Jack up car. Remove wheel. Unbolt and remove brake caliper. Remove old brake pads paying attention as to how they were attached and where they were placed. Using a C-clamp, push plunger of caliper back in as far as it will go. Put new pads on to caliper. Bolt caliper back in place. Install wheel. Remove jack.
Jack-up the car on the side to be dealt with first, and secure it with jackstands or something that will hold the car up and secure. after this remove the wheel. The caliper has TWO retaining bolts accessed from the back of the caliper. these have to be removed. after this you will be able to pull the cliper off of the disc. Remove the old pads NOTE POSITION OF ANY CLIPS THAT ARE PRESENT for replacement after new pads are installed. If the plunger is too far out to replace the pads and fit over the disc, use a large pair of channel-lock pliers to compress the plunger back in to the caliper. It may be necessary to release the bleeder on the caliper to allow the comperssion of the plundger. 1/2 turn usually is sufficient. replace the pads and reverse the order of steps. repaet on all four, or just front. DO NOT replace just one pad as stopping will cause a sharp turn to the side replaced when stopping.
If it is the rear, please take a good look at the brake pads. One is thicker than the other. You use a thick one and a thin one on each wheel. If you already knew this sorry but I thought ir might help.