Excessive thermal stresses can cause undesirable effects on the material of the brake drum. Which leads to the initiation of a crack. This paper gives the basic idea to analyze thermal stress and thermal expansion in a brake drum of a heavy commercial truck due to temperature distribution in severe braking conditions. The analysis is done using the finite element approach in ANSYS software by stimulating temperature distribution and the thermal stress distribution within brake drum material. The evaluation of simulation results will help in prediction and contribute toward improving the design, modeling, and analysis techniques for the integrity of the thermo-mechanical systems that subjected to high temperatures.