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.
Brake Caliper. When it comes to braking, having a dependable brake caliper is a must. It is the most important component of the whole braking system for it is part that literally stops your car. The brake caliper is a U-shaped device with a piston or pistons on each side of the U.