Trailer Air Lines in a Combination Vehicle

Understanding the Trailer Air Lines in a Combination Vehicle

When it comes to driving a combination vehicle, understanding how the trailer air lines work is crucial for the safety of both the driver and other road users. One important component of the trailer air lines is the service line, which plays a vital role in controlling the pressure to the trailer brakes.

On the trailer air lines of a combination vehicle, the service line connects to the relay valves on the trailer to control the pressure to the trailer brakes.

What are Relay Valves?

Relay valves are key components in a combination vehicle's air brake system. They are responsible for applying more or less pressure to the trailer brakes based on the signals they receive from the service line.

The service line is connected to the relay valves on the trailer to apply more or less pressure to the trailer brakes. They connect the trailer air tanks to the trailer air brakes.