The brake fluid reservoir rubber for a Citroën 11CV is a crucial component of the braking system. This rubber part ensures an optimal seal of the reservoir, prevents brake fluid leakage, and protects against contamination and moisture. Over time, rubbers can harden or wear out, affecting the operation of the braking system. Timely replacement of the reservoir rubber contributes to the vehicle's safety and ensures the braking system continues to work efficiently. Specifically designed for Citroën 11CV models, it is an important investment in maintaining classic vehicles.