A high-safety semi-slope take-off device for preventing sliding backward of motor-driven vehicle is composed of flywheel installed to one of shafts in power drive unit, a driven gear engaged with the said flywheel and with a fixed single arm, a general braking pump with an output tube communicated with the original braking system, and an one-way valve installed to the output oil tube of the original and the general braking pumps. The said fixed single arm is connected to the push rod of the said general braking pump. |