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What is the correct order of steps for a pre-trip air brake inspection?

A) Chock wheels; tractor protection system; park control valve; supply circuit; air system leaks; service brake response.

B) Tractor protection system; supply circuit; park control valve; air system leaks; service brake response; chock wheels.

C) Air system leaks; supply circuit; park control valve; tractor protection system; service brake response; chock wheels.

D) Park control valve; air system leaks; service brake response; chock wheels; supply circuit; tractor protection system.

Answer :

Final answer:

The correct sequence for a pre-trip air brake inspection should start with chocking the wheels and proceed to checking the tractor protection system, park control valve, supply circuit, air system leaks, and finally testing the service brake response. Answer A is the correct sequence.

Explanation:

The correct order of steps for a pre-trip air brake inspection is extremely important for safety and compliance with regulations. The steps are typically followed in a sequence that ensures the brake system is fully functional and any issues are identified before beginning a trip. Here is the proper sequence:

  1. Chock wheels
  2. Check the tractor protection system
  3. Examine the park control valve
  4. Inspect the supply circuit
  5. Check for air system leaks
  6. Test the service brake response

By following these steps in order, a driver can ensure that the truck's air brake system is safe to operate. Therefore, the correct answer is A: Chock wheels; tractor protection system; park control valve; supply circuit; air system leaks; service brake response.

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