Question

When you push the trailer air supply control valve, What should happen to the spring?

1) The spring should release
2) The spring should compress
3) The spring should remain in the same position
4) The spring should break

Answer 1

When you push the trailer air supply control valve, the correct response is that the spring should release due to the compressed air overcoming the spring tension, allowing the wheels to rotate because the brakes are disengaged.

Step-by-step explanation:

When you push the trailer air supply control valve on a heavy vehicle, such as a truck with a trailer, the correct response should be that the spring brakes are released. This is because pushing the valve allows compressed air to fill the spring brake chambers, and as a result, the force of the compressed air overcomes the spring tension. Consequently, the spring should release, which in turn allows the wheels to rotate because the brakes are no longer applied.

So, the correct answer to the question is: (1) The spring should release. This function is essential for the operation of the trailer brakes, and if the spring were to compress further or remain unchanged, the brakes would not disengage properly. The option of the spring breaking is simply incorrect and presents a dangerous scenario that should not occur during normal operation of the trailer air supply control.