Rotors receive intense heat stress when you apply pressure to your brake pedal. They are made to dissipate heat quickly but heavy use can cause them to warp under the high level of heat.

Calipers act as strong clamps act apply hydraulic pressure to the brake pad.

The calipers also receive tremendous heat when applying pressure and the constant heating up and cooling can cause external and internal corrosion.

Over time the corrosion can cause the calipers to become sticky and which can cause premature wear on the break pads or pulling the vehicle to the right or left when the brakes are applied.