The CALORSTAT by Vernet Brake Warning Light Switch (BS4640) is designed to monitor the hydraulic pressure within your braking system. When a fault is detected, such as a significant drop in pressure due to a leak, this switch activates the brake warning light on your dashboard, alerting the driver to a potential issue. Proper functioning of the brake warning light is essential for vehicle safety. It provides a critical visual cue that allows drivers to identify and address potential brake system malfunctions before they become serious hazards. This switch is a key component in ensuring the integrity of your vehicle's safety systems. CALORSTAT by Vernet is known for producing reliable automotive components. This brake warning light switch is manufactured to meet stringent quality standards, ensuring dependable performance and longevity. Replacing a faulty switch promptly is recommended to maintain optimal braking safety.