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Most cars come with disc brakes in the front, and many models also have disc brakes in the rear. A caliper is part of the disc brake system. When you press the brake pedal, the brake fluid flows from the master cylinder to the calipers. Brake fluid then applies pressure on the piston inside the caliper, pushing the brake pads against the rotors to slow/stop your car. A car can have either 2 or 4 calipers. If the car has rotors on all four tires, then it will have four calipers. If the car has two rotors and two drums, then it will come with two calipers in front. The calipers can become contaminated, rusty, and start to leak brake fluid. Brake calipers absorb a lot of heat generated from the braking system. Over time, this heat can destroy or weaken the seals inside the calipers. Caliper servicing is usually done as part of a brake service job.
Work on brake calipers would likely include new brake pads because if the calipers have gone bad, it is very likely that the brake pads are worn out.
All services associated with proper function of your brakes are important. In addition to safety issues, ignoring small repairs can quickly lead to more serious (and more expensive) problems.