Safety is always associated with the effective usage of the braking phenomenon of the automobiles. Disc brakes in fourwheelers compared to solid disc type, ventilated disc brake rotor design helps to cool down the disc from heat generated due to friction with the air vents provided. Frictional heat generation in disc brake which leads to severe negative effects, i.e. thermal cracks, brake fade, premature wear, rotor disc thickness variation, etc. So, the precision of temperature distribution and geometry of the disc brake rotor plays a key role in cooling factor of the disc brake and squeal noise generation during braking also plays a major role in deciding the effectiveness of a disc brake with respect to brake fade. In this study, by changing the geometry of the disc brake rotors is to analyze the thermo-mechanical behaviour of the solid and ventilated disc brakes and using the coupled transient thermal and static structural analysis is performed using Finite Element Methods with the help of ANSYS. It is used to determine the temperature, deformation, stresses, and strain fields established in various models of disc brake rotors. Computational Fluid Dynamics (CFD) analysis is performed to investigate the wall heat transfer coefficient of ventilated disc brake rotors using ANSYS Fluent software. From the above CFD analysis, due to changing of vane shapes, there is a considerable increase (10.25%) in modified straight rectangular vane compared to the rectangular vane in heat transfer coefficient of the rotor. Finally, modal analysis is performed using ANSYS to check the disc brake squeal. By comparing the parameters, i.e. temperature, stress distribution is validated with the analytical results, and thereby the optimized or best disc brake rotor is proposed for the effective usage of braking operation of a four-wheeler.