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Answer :
Final answer:
The emergency brakes can be applied by using the spring brake control valve because it controls the release and application of the spring brakes, allowing for manual engagement in case of service brake failure. Therefore, the correct option is B.
Explanation:
When a vehicle's service brakes fail to apply, the emergency brakes can be applied using the spring brake control valve, represented by option b). This valve is a crucial component in air brake systems. It controls the release and application of the spring brakes on the rear wheels of the vehicle.
In the event of a service brake failure, the spring brake control valve can be manually activated to engage the spring brakes, bringing the vehicle to a stop. This action essentially uses the power of stored spring energy to act as an emergency brake.
Spring brakes are designed to be fail-safe, ensuring that if air pressure is lost or service brakes fail, they will automatically engage to prevent the vehicle from moving.
The spring brake control valve gives the driver manual control over this process, providing a reliable way to stop the vehicle in emergency situations. It's a critical safety feature in commercial vehicles with air brake systems, and understanding how to use it is essential for drivers to respond effectively to brake failures.
Therefore, the correct option is B.
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