Correct answer
To prevent overpressure in the system circuit.
It prevents overpressure by limiting maximum air pressure in the system’s supply. It differs from a quick-release valve, which exhausts air from the brake cylinders when braking ends, and reservoir drains, which remove condensation. It does not bleed hydraulic-fluid lines or serve as the valve admitting air to the semi-trailer circuit. These components perform different functions.
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To automatically purge the air present in the hydraulic-fluid lines.
To allow air to pass into the semi-trailer circuit.
To prevent overpressure in the system circuit.
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