This research work is related to automobiles which are used to apply/release parking brakes of the vehicle when driver leaves/takes the seat. We use load cell to sense that there is somebody on the driving seat or the seat is empty. A load cell is a kind of transducer which is used to change mechanical force into a measurable electrical output, anything which needs to be weighed probably uses a load cell to do so. The Hand brake lever is coupled with rack and pinion setup (for vehicles with electronic parking brake system there will be no hand brake lever). A motor is also coupled with this rack and pinion setup to apply and release the hand brake automatically when it gets the signal to do so. The motor is driven by the control unit (Micro controller/Arduino) using load cell sensors. Sensors give a signal to control unit whether the seat is empty or there is someone sitting on the driver seat. The whole system is programmed in such a manner that when the set amount of force applied to the load cell decreases (i.e. driver leaving his seat), the electrical signal changes proportionally which will actuate the motor coupled with the brake system to apply/release the parking brake