it is with power off function, means when braking,the power is off TEKTRO Hydraulic Disc Brake Rotor： 160mm Diameter, 6-Bolt Type, Suitable Most Bicycle,MTB Bike. Lightweight Design,Weight 96g(do not include screws) ZOOM HB-870E Electric Bike Hydraulic Brake Set with Brake Sensor： Special Design for Electrci Bike, Have a Brake Sensor,When Brake will Cut Off Motor Power Color: Black Brake direction: left front, right rear (front oil dish without conversion bracket)  Tubing length: Front Oil Tube 750mm,Rear 135mm is eaten up by hydraulic line fittings. Suitable for models: leisure / entertainment class XC ultra-low cost hydraulic brake, line brake price loaded oil brake, a good choice of entry oil brake Note： Do not put the red pad before installation and empty pinch the brake lever, otherwise it will lead to oil spills or oil dish scrapped
