The brake line on the right front (RV) caliper of a 1965 and later Citroën DS is a crucial component of the braking system. This line ensures efficient transfer of brake fluid from the master cylinder to the caliper, resulting in effective braking performance. The brake line must withstand high pressure and temperature and is specifically designed for classic Citroën DS models, ensuring safe and reliable operation. It is vital to regularly inspect and replace the brake line as needed to maintain the safety and functionality of the braking system.