The copper sealing ring measuring 14x18x1.5 mm is a key component of the Citroën 2CV brake system. It provides a secure seal between the brake line and cylinder, preventing hydraulic fluid leaks and ensuring efficient brake operation. Made from copper, which offers excellent thermal and electrical conductivity, this ring maintains its shape and integrity under pressure and temperature variations. Essential for vehicle safety, this sealing ring should be regularly inspected and replaced if necessary to ensure optimal performance and safety.