Vehicle accidents often occur because of a failure in the braking system of the vehicle. Investigating the causes of brake failure suggests that failure in the braking system is caused by excessive heat due to friction between brake elements to withstand the load and speed of the vehicle. Malfunction of braking system, for example a less gripping caliper will be seen from the heat produced by the brake lining. If one of the brake units does not work, the braking load from other units will increase and can cause excessive heat. This incident is common in tank trucks that cause explosions. This project is aimed to investigate the cause of braking system failure in tank truck using brake temperature sensor. The sensor could analyze the brake performance by determining the safe temperature of the drum brake itself. The sensors would be placed in all drum brakes to detect the temperature in each wheel. If one brake is not functioned on the safe temperature, the sensor would alert the driver. By applying this method, the risk of accident would be reduced.