What Is The Emergency Air Line For: A Critical Safety Component Explained
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What Happens If Emergency Air Line Breaks?
What occurs when an emergency air line breaks? When there is a rupture in the supply line, or when the connection between the supply line gladhands becomes disconnected (as shown in Fig. 47), it leads to a significant decrease in pressure within the supply line that extends from the trailer-supply valve to the relay emergency valve. This drop in pressure initiates an emergency response from the relay emergency valve, which promptly activates the trailer brakes, putting them into an emergency application mode. In essence, when the emergency air line breaks or disconnects, this safety mechanism ensures swift and automatic brake engagement on the trailer for enhanced safety on the road.
What Is The Red Air Line On A Truck?
The red air line on a truck, known as the supply air line, serves two crucial functions. Firstly, it provides compressed air to fill the trailer’s air tanks, which is essential for various pneumatic operations. Secondly, it plays a pivotal role in controlling the emergency brakes of the trailer. In case of an air pressure drop, such as a detachment of the trailer or a rupture in the supply air line, the emergency brakes on the trailer will automatically engage as a safety measure. This ensures that the trailer comes to a halt promptly, preventing potential accidents or hazards caused by an uncontrolled runaway trailer.
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The emergency line (also called the supply line) has two purposes: (1) To supply air to the trailer air tanks, and (2) to control the emergency brakes on combination vehicles. Loss of air pressure in the emergency line causes the trailer emergency brakes to come on.Rupture of the supply line (or an uncoupling of the supply line gladhands – Fig. 47) results in a pressure drop in the supply line between the trailer-supply valve and relay emergency valve. This triggers the emergency action of the relay emergency valve, placing the trailer brakes into emergency application.The supply air line (red) has two functions. The first is to supply air to the trailer air tanks. The second is to control the emergency trailer brakes. In the event of a loss of air pressure, for example if the trailer becomes detached or the supply air line is broken, the trailer emergency brakes will activate.
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