Truck Spare Parts Trailer Quick Connect Coupling Trailer Air Line Gladhand With Shut-off Valve For Howo Sinotruk 300-3723100

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truck spare parts Trailer Quick Connect Coupling Trailer Air Line Gladhand with Shut-off Valve for howo sinotruk 300-3723100

Function

1. Enables quick connection and disconnection of the air lines (brake air lines) between the tractor and trailer; the self-sealing valve on the trailer side automatically closes upon disconnection to prevent air leakage; the quick connector on the tractor side ensures reliable transmission of high-pressure air to the trailer braking system.
2. Features a spring-loaded self-sealing structure – when connected, the connector pushes the valve core open to allow airflow; when disconnected, the spring returns the valve core to its closed position, creating a seal; the interface conforms to international standards and supports simultaneous 12/24V electrical signals.

3. It is connected to the main vehicle's air reservoir, foot brake valve, parking brake valve, trailer brake valve, ABS/EBS system air lines, and quick-connect air fittings; it is usually installed at the rear of the chassis or near the rear bumper and used in conjunction with the trailer's 7-pin electrical connector.
4. Air leaks can lead to insufficient or complete loss of braking pressure in the trailer, resulting in trailer brake failure (significantly increased braking distance or no braking); failure of the self-sealing mechanism after disconnection causes a rapid drop in the main vehicle's air pressure, affecting the entire vehicle's foot brake/parking brake; in extreme cases, it can cause the trailer to roll downhill or lead to rear-end collisions; the instrument panel air pressure warning light illuminates, and the vehicle may be speed-limited or unable to operate normally.

DETAILS

symptom

1. The self-sealing mechanism fails, causing continuous air leakage after disconnection, and the main vehicle's air pressure drops to the alarm level;
2. Air leakage persists after connection, resulting in insufficient air pressure for the trailer brakes.
3. The connector is corroded and stuck (difficult to plug in and out);
4. The spring is fatigued (weak self-sealing);
5. The sealing ring is aged (slow air leakage);
6. Foreign objects are blocking the valve core (reduced airflow);
7. Delayed braking on the trailer side.

Troubleshooting suggestions

1. Typical failure symptoms triggering replacement: Rapid pressure drop in the tractor unit after disconnecting the trailer, weak or no braking in the trailer, air leak sound ("hissing") at the connection point, sticking self-sealing valve (unable to disconnect or difficult to connect), and frequent air pressure alarms.
2. Recommended preventive replacement mileage/time: Inspect/replace every 200,000-300,000 kilometers or every 2-3 years; shorten to 150,000 kilometers for high-intensity long-distance transport or winter driving on salted roads; replace simultaneously when overhauling the air brake system.

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