drum brake 1)wide torque scale 2)not easy to produce fire 3)long life time, easy to keep comfort drum brakeNAB5modelSTATIC FRICTIONSIZE 0.6mpaABCDEFGHJKNAB0.55.39(53)2515068.527.8117126.534.564rc1/4 in continuously use of tension control system, the M5 entry should be promoted by air, and strongly to produce cold air to raise its power and prolong its life.