M939, what are the air lines on the park brake doing?

[wheelspinner]

Is that in the -10?

Not in so many words. Its one of those experience items. -10 says its for releasing the spring brake to adjust the manual brake, and that the tank exsists for

F. SPRING BRAKE AIR RESERVOIR​

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- Stores enough air pressure to release spring brakes for emergency​

operation in event of primary or secondary air system failure.

 

[Floridianson]

Good call Spinner, simple as checking the valve from the driver's seat.. Wish they all were like that.

 

[Gunzy]

This is the only case that a "Fart" is good to hear.