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The hydraulic brake system is primarily responsible for providing anti-skid functionality in transport aircraft. Anti-skid systems work in conjunction with the hydraulic brakes to optimize braking performance and prevent wheel lock-up during deceleration.

When an aircraft lands, the hydraulic brake system applies the brakes to slow down the aircraft. The anti-skid system continuously monitors the wheel speeds and compares them to determine if any wheel is about to lock. If a wheel is detected to be spinning slower than the others—indicating impending skid—the system automatically reduces the hydraulic pressure applied to that wheel's brakes. This modulation of brake pressure allows the wheels to maintain traction with the runway surface, improving control and safety during landing and ground handling.

In contrast, while the electrical control system may be involved in the operation of the anti-skid system, it is the hydraulic brake system that directly manages the braking forces. Mechanical brake actuation, although involved in traditional brake systems, does not inherently provide anti-skid functionality as it does not support the dynamic adjustment of brake pressure. Pressure monitoring sensors play a role in systems that rely on monitoring hydraulic levels or detecting abnormalities, but they do not actively control the anti-skid functions themselves. Thus, the hydraulic brake system is integral to the operation and effectiveness