When the air pressure is added to push the piston, the friction plate is squeezed from both sides of the brake, when the air is excluded, the release of the spring release is released.
For air pressure change is very sensitive, high precision torque control, piston seal is no need oiling type, each brake modules above are separate installation manual pressure valves, push to open, push back to close, demand torque variation is large can change braking mode block as number.