Nov 13, 2026
What Are the Key Components of a Foot Brake Valve?
What Are the Key Components of a Foot Brake Valve? In a heavy-duty truck, bus, or trailer air brake system, the foot brake valve — also called a treadle valve or application valve — is the driver's direct command point. It converts mechanical pedal effort into a proportional air-pressure signal that controls the service brakes. Knowing its components helps technicians diagnose leaks, slow release,...