Spring Brake Chamber and Caging Bolt: What You Need to Know

What happens when a spring brake chamber is disabled by a caging bolt or other mechanism?

a) it looks the same to a driver.

b) the spring brake will still apply.

c) the service brake will not apply.

d) the spring brake will not apply.

Answer:

When a spring brake chamber is disabled via a caging bolt or another mechanism, it leads to the non-application of the spring brake.

When a spring brake chamber has been disabled by a caging bolt or other mechanism, the result is that the spring brake will not apply (option d). This is because the caging bolt effectively locks the spring in place, preventing it from applying force to the brake.

This does not mean it looks the same to a driver, as it should prompt a different feel or system feedback. However, the service brake will not be impacted by the disabling of the spring brake.

Therefore, the most accurate statement is d) the spring brake will not apply.