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In a Spring Brake Priority Trailer, what happens when the trailer supply button is pushed in?

A. Both the spring brakes and trailer service brake reservoirs charge at the same time.

B. The spring brakes release first, then the trailer service reservoirs charge.

C. The trailer service brake reservoirs charge first, then the spring brakes release.

Answer :

Final answer:

When the trailer supply button is pushed IN, the trailer service brake reservoirs charge first, followed by the release of the spring brakes. This sequence is important for maintaining safe braking performance. Thus, option (C) describes the correct operation of the system.


Explanation:

Understanding the Spring Brake Priority Trailer System

In a Spring Brake Priority Trailer system, the operation of the trailer supply button is crucial for the braking mechanism. When the trailer supply button is pushed IN, the following occurs:

  1. The spring brakes are designed to engage when there is a loss of air pressure, but when the button is activated, it initiates a sequence.
  2. First, the trailer service brake reservoirs receive air pressure. This mechanism allows for gradual control of braking and ensures safety.
  3. Once the service reservoirs have charged sufficiently, the spring brakes will then release. This sequence allows for the trailer to avoid sudden movements that could lead to instability.

In conclusion, option (C) is correct: the trailer service brake reservoirs charge first, then the spring brakes release. This priority helps maintain controlled and effective braking performance while towing.


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