Hit a Wall on this air leak problem?

I believe it is the Brake Pedal Treadle venting till my 3 Tanks are empty over night? I have a hard time following long explanations of a repair due to my old age?? A picture of what I am getting into would be nice. I think it is the part operated by the Brake Pedal just behind it. Sure as heck do not want to just start taking stuff apart. Flustered cause we have a fire about 10 miles away. It could turn and come this way and be here tomorrow in high winds? Not to worried but don't want my truck tore apart to far during this time. Would like to repair it or just replace it completely? Can I get this part at NAPA or where if not? Been searching here for what I am about to do but not very sure about the repair yet? Thanks guys sorry wish I could read how to do stuff better but to me a picture is a 1,000 words in my mind. Not sure why but I forget what I read as I go along on long reads? Here are the picture of what I think others are talking about needing repaired? Not a fun one to me??

This is about all I found in 780 pages of the TM Manual; The foot control valve (5) receives pressurized air from both the primary and secondary air tanks. The foot control valve is a two circuit design, with one set of ports directing air to the front brakes from the secondary air tank and a second set of ports directing air to the rear brakes from the primary air tank. The plumbing between the primary and secondary air tanks is designed to allow controlled braking in the event of a failure in either the primary (rear brakes) or secondary (front brakes) brake circuit. When air pressure in the wet tank (6) falls below a preset limit, pres-surized air, normally used for the CTIS, is redirected to the primary brake circuit.

I will admit there is a ton of info in that TM I will put to use just wish I had it in paper back to thumb thru quicker?

You are allowed to lose 2 pounds per minute in a straight truck with the parking brake released. There is no standard for when it is applied and there is no air in the system past the applicator valve. mA truck that looses its air over night (8 - 10 hrs ?) is not unusual. The issue is how fast does it lose air when the parking brake is released and if the parking brake is released and the service brake is applied.

fasttruck said:

You are allowed to lose 2 pounds per minute in a straight truck with the parking brake released. There is no standard for when it is applied and there is no air in the system past the applicator valve. mA truck that looses its air over night (8 - 10 hrs ?) is not unusual. The issue is how fast does it lose air when the parking brake is released and if the parking brake is released and the service brake is applied.

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I noticed the air low just sitting with my foot on the brake a little idling. Does not leak when pushing the pedal down. My buzzer comes on around 80 PSI a little early should be closer to 65-70 psi? Other then that I notice no difference in the braking action or air staying up. The compressor will stay ahead of this leak.