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Answer :
Final answer:
In the case of a trailer's service brake failure, the spring brakes can be activated using the trailer supply valve. This valve serves as an emergency brake valve to apply the spring brakes which are designed as a fail-safe mechanism.
Explanation:
When a trailer's service brakes fail to apply, the trailer spring brakes can be activated by using the c) trailer supply valve. This valve is also known as the emergency brake valve, and it controls the flow of air to the trailer's emergency brake system. In the event of a service brake failure, the trailer supply valve can be manually operated to apply the spring brakes, which are a fail-safe mechanism designed to stop the trailer.
Understanding how this works can be tied back to fundamental hydraulic brake principles, like Pascal's principle, which states that a pressure change in a confined fluid is transmitted undiminished to every portion of the fluid and to the walls of its container. Although the trailer spring brake system does not operate hydraulically but pneumatically, the same foundational idea of pressure initiation and uniform force application across a system applies. Nonetheless, when dealing with brake failures, the trailer supply valve offers a mechanical solution to engage the emergency braking system.
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