NAB type (standard)-Coaxial Pneumatic brake, is to use the cone-shaped bushings with wedge to connect with the axis, the purpose of the friction plates is that in the case of maintaining machinery, it can exchange the structure. Using the piece installed on the disk of the wheel to emit the heat generated of rubbing. Friction plate is double-board, through the hole of the wheel, after taking out the screw with screwdrivers, then exchanging friction plate.