The emergency air line:
Answers
Is controlled by the foot brake.
Is connected to the relay valves.
Supplies air to the trailer air tanks.
Prevents skids.
The Correct Answer and Explanation is :
The correct answer is: Supplies air to the trailer air tanks.
Explanation:
The emergency air line, also known as the emergency brake line or the red line in truck and trailer systems, plays a vital role in ensuring the safety and proper functioning of a trailer’s braking system. In a typical combination vehicle setup, such as a tractor-trailer, there are two primary air lines that connect the tractor (truck) to the trailer: the service air line and the emergency air line.
- Purpose of the Emergency Air Line: The emergency air line is primarily responsible for supplying air to the trailer’s emergency brake system. This line ensures that the trailer’s braking mechanism remains operational even if there is a failure in the service air line or if the connection between the tractor and the trailer is severed.
- How It Works: The emergency air line connects to the trailer’s relay valves and emergency brakes. If the air pressure in this line drops, it activates the trailer’s emergency brakes. This is a safety feature to prevent a trailer from becoming detached and rolling away uncontrollably in case of a separation between the truck and trailer or if there is a failure in the service air system.
- Distinguishing from Other Air Lines:
- The service air line (often referred to as the blue line) is responsible for controlling the regular braking system of the trailer. It supplies air to engage the brakes when the driver presses the foot brake in the truck’s cab.
- The emergency air line, in contrast, maintains air pressure to the emergency brakes and the trailer’s emergency brake system. It works independently from the service air system to ensure that the trailer can be stopped in case of an emergency.
- Safety Importance: The emergency air line is critical for the safety of the vehicle and others on the road. If the emergency air line loses air pressure (such as when the connection is broken), the trailer’s emergency brakes are automatically activated. This ensures the trailer comes to a stop, preventing potential accidents caused by a runaway trailer.
In summary, the emergency air line’s role in supplying air to the trailer’s emergency brakes is a crucial part of maintaining safe operation and preventing accidents in the event of an air pressure loss or detachment between the truck and the trailer.