Before the introduction of the euro, francs were also used in France, Belgium and Luxembourg, while Andorra and Monaco accepted the French franc as legal tender (Monegasque franc).
Inside the caliper is a brake pad, a small block of friction material backed with a metal plate. When you step on your brake pedal, pistons inside the caliper cause it to apply pressure to the brake pad which squeezes the rotor, causing the car to slow or stop.
A caliper is the mechanism in a disk brake system that uses a pinching action to cause the brake pads to press onto the disk. 1  The rear brakes have a 220mm floating disk with a single caliper. 2  The job of the caliper is to squeeze the brake pads against the rotor surface in order to slow the car.