Explain primary and secondary air tanks to me

You can probably search Bendix and get a complete break down. Basicly 3 tanks. Wet, primary, and secondary. All have back flow check valves. Big horn probably off wet tank or an add on tank feed from the wet tank, with a restrictive feed port, so it does not compromise brake operation. Coupler: Either dry tank.

 

Yes, the two system are totally separated by check valves. It is a slip system so if you have a massive leak in one system, you still have pressure in the other for your brakes. Primary is normally only your rear brakes and secondary is usually your front brakes and all your accessories. Usually axillary stuff is plumed from the secondary system.

 

Yes, but the trailer also functions off the secondary side and train horns are not usual auxiliary stuff. I was just thanking that if there was a justifiable need for a lot of horn action the brakes might be getting an equal work out. Would not want to lose any brake operation for a horn and it might be best on it's own system. Tank, check valve and maybe a valve to control air flow pressure similar to PTO's?

 

If you're interested in learning how air brakes work, I highly recommend www.brake-school.com. It is from Bendix and free to register and take courses. Once you register, the first one you want to take is the System Training course that covers all the basics.

 

On all of these Truck/Trailer Air System Diagrams there is no Air Bags, as if Air Bags are not a part of air System. Why?
My cab air bags and on drives are not inflated, also secondary air tank is empty and cant build up pressure and engine fan is on all the time. I can't find a diagram which explains how air bags are supplied.

 

No they are independant.

Wet tank gets first air.

Air dryer gets the dry air into the secondary.

Yes, the two system are totally separated by check valves. It is a slip system so if you have a massive leak in one system, you still have pressure in the other for your brakes. Primary is normally only your rear brakes and secondary is usually your front brakes and all your accessories.

Taken from TTR post approximtely 2015. Computer hung up on my end across desktops so I patched it straight in.

 

It has been 10 hours. Got that worked out?

 

Not yet. I'm still trying to figure it out by myself. I also have no air in Driver and pass. seats and no air horn.
I think it might be one of the check valves that goes to one of the tanks, or Pressure Protection Valve on the faulty tank.
When I dropped my truck for 2 weeks everything worked fine, no problem, but when came back to charge the batteries and turned the truck On then I saw this problem. The truck is still driveable under 5mph, without Airbags I feel every stone on the road.