A train disc brake system is used to perform three basic functions, i.e. to reduce speed of a vehicle, tornmaintain its speed when travelling downhill and to completely stop the vehicle. During these brakingrnevents, the disc brake may suffer of temperature, deformation and stress issues. It is quite sometimesrnthat the disc brake components fail structurally and/or having severe deformation on the pad. Thus,rnthis paper aims to examine stress concentration, structural deformation and contact pressure of brakerndisc and pads during braking event by employing commercial finite element software, ANSYS andrnCATIA for modeling purpose with considering the effect of unequal pressure application on the twornopposite side of the disc which are developed due to brake line corrosion, caliper sticking, failure ofrnpiston seal, variation of rotor thickness and also failure of caliper bolts.rnThe main results of this analysis is consider factors which are relate about disc brake structure andrncontact behavior such as deformation, Von Misses stress and temperature which rise when breakingrnaction with considering the unequal heat flux which generate on opposite side of disc when unequalrnpressure applied on two opposite side of the disc and define from the analysis result there is a highrndeformation, stress and temperature difference between equal pressure and unequal pressure appliedrnon two opposite side. I.e. when unequal pressure applied on two opposite side, there are greaterrntemperature, heat flux, deformation and stress as compare with equal pressure applied on two oppositerndisc side