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The pursuit of safer and more reliable car is the trend of modern automobile engineering. The major protection against an automobile accident is the brake system. However, to date, there is no safety device, which is designed to prevent failure from high temperature of the hydraulic brake system. In general, the brake force is generated from the friction between brake shoes and brake drums or disks. As the vehicle slows down, the moment of inertia of the vehicle is transformed into heat to raise the temperature of the brake system. The rapid rising of temperature may result in serious safety concerns of the brake system and its failure could be expected. The main purpose of this research is to develop a device, which can detect high temperature in the hydraulic brake system and provide a safety alarm before it fails. The device utilizes temperature sensors to monitor temperatures of the brake shoe lining and hydraulic fluid of the brake wheel cylinders.