Brake mechanism for the Flow system of sliding doors, especially useful for cabinets thanks to its parts are light but resistant. This optional installation piece is easily coupled in the lane to obtain an optimized setting when closing or opening the Door. Its measurements are 48 mm long and 16 mm high in total, with a width of 12 mm. The brake manufacturing material is gray plastic, with a unique presentation. As an essential product for installation, it requires FLOW caps for sliding doors. The packaging is carried out in 40 units.