Conventional bicycle or rear car braking system is manual, and the rubber peking attached to the change of the conveyer by hand force winds the wheel of the changer to stop the driving lubrication of the conveyer. The present invention is a hydraulic braking device applying the principle of Pascal using hydraulic pressure, that is, the pressure transmitted to the liquid acts the same in all directions and the pressure acts on each side of the container.;The present invention acts on the piston to pressurize the fluid in the main syringe, so that the oil passes through the conduit and the oil in the last acting syringe pushes the piston so that It is a hydraulic braking system that stops the change by pressing the drive shaft on both sides such as round plates.;The structure of the device consists of a main cylinder and a main piston, a pressure pedal attached to the piston, a hydraulic conduit, and a final cylinder and a rubber seal attached to the piston.;The brake system consists of a pedal or knob that can apply pressure, and a spring is provided to return the pedal or knob to its original position. The fluid contained in the cylinder is delivered to the final piston, and the hydraulic cylinder pushes the operating cylinder, which causes the two hydraulic cylinders to move in opposite directions, driving the wheels of the vehicle or the drive shaft connected to the wheel It is a device that acts to stop the driving device of the carrier when pressure is applied.;Therefore, by attaching the present device to the port, the pressure of the brake is increased by hydraulic pressure, which is higher than the pressure of holding the brake by hand, and the safety can be maintained. However, the hydraulic method with the highest viscosity, lubricity, and low evaporation or consumption is applied. However, depending on the speed and load of the bicycle, hydraulic pressure, hydraulic pressure and air pressure can be used.
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