What happens when a spring brake chamber has been disabled by a "caging bolt" or other mechanism?
The correct option is d) "the spring brake will not apply," as disabling the spring brake chamber with a caging bolt or similar mechanism prevents the spring brake from engaging, and the vehicle will not be secured by the parking brake.
Explanation:
The correct option is not b) "the spring brake will still apply." In fact, it's the opposite. When a spring brake chamber has been disabled by a "caging bolt" or other mechanism, the spring brake will not apply. The correct option should be d) "the spring brake will not apply."
Spring Brake Chambers:
In heavy vehicles like trucks and buses, there are two types of brakes: service brakes and spring brakes. The spring brake is an important component of the parking or emergency brake system.
Spring Brake Function:
When the parking brake is applied, the spring brake chamber uses compressed air to release the spring brakes, allowing them to engage and hold the vehicle in place. This is the brake system that keeps a parked vehicle from moving.
Caging Bolt:
A caging bolt is a mechanical device used to manually disable or cage the spring brake chamber. When the spring brake chamber is caged, it prevents the spring brakes from engaging even when the parking brake is applied.
Disablement of Spring Brake:
When a caging bolt or similar mechanism is engaged, it physically prevents the spring brake from applying, essentially "locking" it in the disengaged position.
Driver Perception:
To a driver, when the spring brake is caged, it may look the same as if the parking brake is applied, but in reality, the spring brake is not engaged, and the vehicle is not secured by the parking brake.