The brake fluid reservoir is part of the THV. It is made of white transparent plastic, it has the marks of the highest and lowest liquid level allowed (MAX and MIN). The tank, with its lower outlets, enters through the rubber bushings into the holes in the THV. In addition, it is secured by lugs in the uprights, which, after unbending, snap onto a finger passing through the central boss in the THV.
A signaling device is inserted into the tank cap with a turn, notifying of a drop in the brake fluid level below the permissible level. The body of the signaling device is inserted so that the cover can be unscrewed without disconnecting the connector of the supply wires. A mesh is inserted under the cover to trap dirt from the poured liquid.