air system under front bumper

what's this air system assembly under the front bumper?

 

yes! replaced the whole (original 7 year old) dryer assembly and both tanks fill now. truck still won't hold air overnight tho, depending on ambient temp it might be at 60psi or it might be 0psi.

I know one leak is coming off of primary tanks thru a big green output line, another 7 year old quick connect that's served its time, it's only loud if it's ~35f ambient. just found this other audible one from up front under the bumper but the only soap spray bottle i have is a mister, can't get a squirt close enough right now to make any bubbles.

here's the originals not ran through meme generator




front ABS modulator valve? it's got that black round flap on the bottom distended part




youtube hive mind say check valves in brake chambers go bad too and leak through ABS valve purge...




utube hive mind also say air leak location is most likely not the actual problem...

 

I did notice with the drain valves they keep hissing sometimes unless you tap them again lightly.

is there any way to shut off the low air alarm before starting the truck? in airplanes there's always an alarm cancel, in this truck you can't see battery or oil temp before startup if the tanks are empty cause the dash is just OMG U HAVE NO AIR