Brake caliper ZL40.12.4C/ 250200143 for XCMG Wheel Loader Spare Parts LW500F

What is the difference between a car brake caliper and a brake disc? What is the use?
The current brakes can be divided into three types: drum type, disc type and belt type according to the structure of the friction pair.
Brake calipers and brake discs exist on the disc brakes. When the car is running, the brake discs rotate with the wheels and the brake calipers are fixed. When braking, the brake calipers clamp the brake disc to complete Braking effect

when to replace brake calipers？
Most brake calipers do not need to be rebuilt or replaced the first time the brakes are relined. But after 75,000 miles, or seven to 10 years of service, the calipers may be reaching the end of the road. As the rubber seals age and harden, the risk of sticking and leaking goes up.