Answer :
Final answer:
When the Park/Emergency Brake Control Valve button is pulled OUT, the inlet port is open, and the Park/Emergency brakes are engaged. This allows air to fill the brake chambers, ensuring the brakes are applied and the vehicle remains stationary. This functionality is vital for vehicle safety, particularly on inclines.
Explanation:
Understanding the Park/Emergency Brake Control Valve
The Park/Emergency Brake Control Valve is a key component in vehicle braking systems, particularly in trucks and larger vehicles. When the button for the Park/Emergency Brake Control Valve is pulled OUT, it indicates specific actions regarding the brake system.
Correct Option
The correct answer to the question is OA), which states: the inlet port is open, and the Park/Emergency brakes are engaged. When the valve button is pulled OUT, it effectively engages the emergency brakes by opening the inlet port, thereby allowing air to fill the brake chambers, which activates the brakes.
Why This Happens
- The emergency brake system typically operates through a pneumatic or hydraulic mechanism.
- Pulling the button OUT creates a direct connection to the brake system, ensuring that the vehicle remains stationary.
- This design is essential for safety, particularly in situations where the vehicle is parked on an incline.
In contrast, if the button were pushed IN, it would close the inlet port and release the brake, allowing the vehicle to move. Understanding this functionality is crucial for properly operating and managing the vehicle's braking system.
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