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The hydraulic fluid is a glycol organic compounded which exhibits high temperature characteristics. However, it is amenable to moisture. Moisture content will lower boiling temperature of the hydraulic fluid. Because the high temperature from the brake shoe area can be conducted to wheel cylinders to raise the temperature of the hydraulic fluid, high percentage of moisture content in the hydraulic fluid may result in the boiling of the fluid. The hydraulic fluid will become compressible which will cause the failure of the brake system. In this research, an alarm device is developed which can detect moisture content in the hydraulic fluid by using the resistance measurement. When the percentage of moisture content exceeds the safe range, the device will send an alarm signal to the panel to warm the driver. It can be an inexpensive and easy-installed safety device to an automobile.

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.