What is the primary responsibility of the pressure differential switch in a vehicle?

The pressure differential switch plays a critical role in a vehicle's braking system by monitoring the difference in pressure between the two brake circuits. When the pressure in one circuit drops significantly, which can indicate a potential brake fluid leak or malfunction, the switch activates to alert the driver. This warning system is essential for ensuring the safety of the vehicle, as a loss of brake fluid pressure can greatly impair braking performance.

In contrast, balancing tire pressure, monitoring coolant temperature, and assessing battery voltage are functions associated with other systems in the vehicle. Tire pressure monitoring involves different sensors that specifically track the inflation levels of the tires. Coolant temperature is monitored by a temperature sensor that provides information for the engine management system. Battery voltage assessment is typically handled by the vehicle's charging system and is not related to the brake system's operation. Therefore, the primary responsibility of the pressure differential switch remains focused on brake fluid pressure monitoring and driver warning functions.