Shimano BR-M365 M355 de remplacement Altus. High braking power with precise dosing: Shimano Disc Brake BR-MT200 Hydraulic disc brake with a high, precisely metered braking force in the powerful design. Opposing pistons prevent vibrations. Natural mineral oil as hydraulic fluid, environmentally friendly and is neither toxic nor corrosive, in bicycle hydraulic braking systems, the optimal, M396. At $45 (USD) per wheel, Shimano's M396 model are as cheap as hydraulic brakes come. Numerically they fall into the budget Acera group, which is heavily spec'ed on basic hardtails..