A train disc brake system is used to perform three basic functions, i.e. to reduce speed of a vehicle, to maintain its speed when travelling downhill and to completely stop the vehicle. During these braking events, the disc brake may suffer of temperature, deformation and stress issues. It is quite sometimes that the disc brake components fail structurally and/or having severe deformation on the pad. Thus, this paper aims to examine stress concentration, structural deformation and contact pressure of brake disc and pads during braking event by employing commercial finite element software, ANSYS and CATIA for modelling purpose with considering the effect of unequal pressure application on the two opposite side of the disc which are developed due to brake line corrosion, calliper sticking, failure of piston seal, variation of rotor thickness and also failure of calliper bolts.