Glass brake fluid reservoir for use in hydraulic brake systems of classic Citroën vehicles. The part stores brake fluid and keeps the level visible for inspection. The cylindrical glass body has a rounded shape and fits a suitable cap and connection. It is intended for installation in the engine bay on a fixed bracket. The clear surface makes contamination or air bubbles in the fluid easy to see. This reservoir supports stable operation of the braking system through a constant supply of brake fluid to the master cylinder and limits the entry of dust and dirt from the surroundings.

