Knott Brake Company sells a line of ball ramp wet disc brakes, either in mechanical, hydraulic or hydro-mechanical activation. Knott also annular wet disc brakes designed using Spring Applied Hydraulic Release (SAHR) technology. Because of their fully enclosed nature wet disc brakes if properly utilized offer the maximum possible service life, this benefit comes at the expense of heat dissipation, these brakes are ideal for slower vehicles in difficult work environments.