Before getting out to inspect the coupling, secure the vehicle by putting transmission in neutral, shutting off engine and taking the key with you, and `_________`.

A Putting parking brakes on.

explanation

STEP 12: Secure Vehicle
Put transmission in neutral.
Put parking brakes on.
Shut off engine and take key with you so someone else will not move truck while you are under it.

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Before getting out to inspect the coupling, secure the vehicle by putting transmission in neutral, shutting off engine and taking the key with you, and _________.

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