Correct answer
Prevent overpressure in the circuit.
To prevent overpressure by limiting air pressure in the circuit. Distinguish it from a quick-release valve, which releases air from brake cylinders when braking ends, and reservoir drain valves, which allow accumulated water to be removed. It does not bleed hydraulic-fluid lines, and its function is not to send air to the semitrailer. Follow manufacturer instructions for checking and maintaining the system.
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Prevent overpressure in the circuit.
Allow air to pass to the semi-trailer.
Automatically purge the air present in the hydraulic-fluid lines.
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