One of the braking system problems in a motorcycle is a vapor lock. Vapor lock can occur when brake fluid, the fluid that helps the brake piston movement, experiences increased heat until it evaporates. Vapor lock can occur when the vehicle has been used due to the high-performance load of the braking system. This research aims to create a brake fluid temperature measuring and monitoring tool. By monitoring the brake fluid temperature, vapor lock conditions can be anticipated. To conduct this research, several materials are required, including K-type thermocouple sensor, Arduino Mega module, RGB bright LED, buzzer, and LCD. The accuracy value of the sensor will be calculated. The results showed that under all conditions, the sensor accuracy had a good value, above 98%. When implemented on a motorcycle, brake fluid temperature conditions are divided into four ranges: 29 °C to 124 °C; 125 °C to 134 °C; 135 °C to 145 °C; and above 145 °C. The results of the implementation on the motorcycle were successful overall, where the condition of each actuator changed when the temperature range of the motorcycle's brake fluid also changed. For example, at the highest temperature, the RGB bright LED lights up Red, the buzzer sounds continuously, and the status message on the LCD is “Bahaya!”.