Question

before you begin setting up a pavement breaker, make sure that the air pressure is _____. shut off at the main air outlet turned on only halfway tuned on full shut off at the coupler

Explanation:

For safety and proper - setup of a pavement breaker, air pressure should be shut off at the main air outlet before starting the setup process. This prevents accidental activation and potential hazards.

Answer:

Shut off at the main air outlet