Disc brake is based on a hydraulic pressure system. Braking starts with a mechanical force by your foot pressing the brake pedal.This book is mainly focused on the disc brake rotor design and operation. The disc brake rotor is a rotating device. Braking is a process which converts the kinetic energy of the vehicle into mechanical energy which must be dissipated in the form of heat. This research contains the analysis of the contact pressure distributions at the disc interfaces using a detailed 3-dimensional finite element model of a real car disc brake roto . Finite element (FE) models of the brake-disc rotor are created using CATIA V5R20 and simulated using ANSYS 17.0 which is based on the finite element method (FEM). It is also investigates different levels in modeling a disc brake rotor system and simulating contact pressure distribution.