When doing the final check, how can you tell if the spring brakes activate when the air pressure gets too low?

Check the dashboard for a specific light indicator while driving at a low speed.

Park on level ground, chock the wheels, release the parking brake when you have enough air pressure, shut the engine off, and repeatedly press on and off the brake pedal until the warning light comes on

Drive around the block until the air pressure warning light activates.

None of the above

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