M931A2 Air system performance question and video

M931A2 Air system performance question

I'm checking the performance of my M931A2 air system.

At 1500 RPM my Primary and Secondary tanks can fill from 60lbs to 120lbs in about 1 minute.

I can then shut off the truck and pump the brakes about 12 times before the primary tank goes to around 40 and the secondary tank goes to 60.

Does this seem in line?

Thanks,
Jeff

Yes.

Air system appears normal. I would be more concerned that the voltage gauge stays the same whether the truck is running or not. It appears to have a charging system issue that needs to be addressed.