Shimano acera m396 disc brakethe shimano brm 395 is the most powerful hydraulic disc brake in its class it rivals the stopping power of almost every other disc brake on the market arguably even those that are multiple its cost it is a solid durable system capable of delivering respectful amounts of stopping power to any mountain bike with an exceptionally smooth moving break lever it becomes a simple task to apply exactly the right amount of stopping power desired every time furthermore it