Which system continuously monitors the aircraft brakes under various runway conditions?

The anti-skid system is designed to continuously monitor the aircraft brakes, crucially under various runway conditions. This system prevents wheel lock-up during braking which can occur if the wheels stop rotating and skid on the runway. It assesses the speed of the wheels and the deceleration forces, and if it detects a wheel is about to skid, it modifies the hydraulic pressure applied to the brakes on that wheel. This ensures optimal braking performance, even in adverse conditions like wet or icy runways, allowing the aircraft to stop safely without losing control.

In contrast, the hydraulic pressure system encompasses a broader range of functions related to hydraulic systems in the aircraft but does not specifically monitor braking conditions. The brake assembly system refers to the physical components that make up the braking system without the advanced monitoring capabilities. Lastly, the pneumatic system, while important in various aircraft functions, does not play a role in the active monitoring of brake performance under different runway conditions.