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 stuck brake caliper will cause major problems with handling and steering, as well as creating a burning odor that is hard to miss. If your car has a stuck brake caliper in the front, the chances are good that if you can get going, it will feel is if you have to fight the steering wheel to retain straight line control of your car.