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The Peterbilt Air Brake Pressure Protection Valve controls air flow between brake circuits based on system pressure levels. As air pressure builds, the valve allows air to pass toward downstream systems only after a threshold is reached. This sequencing prevents secondary circuits from drawing air before primary braking needs are satisfied. When pressure drops, the valve closes to preserve air for critical braking functions. The valve reacts automatically to pressure changes without driver input. Its behavior supports staged air distribution during vehicle operation. In brake air systems requiring circuit protection, the Peterbilt 223-585 manages pressure-based flow control.
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