Executive wrote:
robatthelake wrote:
The original and main reason that Air Brake equipped Vehicles have these "Chucks" is to provide a way to Air Up the system for towing. With that in mind the majority will be located up front!
Actually that's only sorta correct...if there is ONE chuck, it's usually up front to ADD air to the system to release the brakes...if there's TWO, one is to air UP the system and the other is to air up other stuff...kinda like an innie and an outie. My innie is up front for the tow truck, the outie is in the bay with the fuel and LP tanks....Dennis
Dennis,
From what I've investigated on my coach, even your statement is only partially correct. By that I mean, I have the fitting w/gauge you see in my earlier post on this thread. That whole setup is the "outie" on mine. On the other side of the front end of the fire wall/Generator access compartment, I have a "Shrader" valve. The only thing that shrader valve will air up is the air supply that's tied to that outlet and gauge. It WILL NOT air up the brake release portion of the system. That's my "innie".
The reason I know this is because, I was replacing the left rear axle hub seal and, in doing so, I had to remove the wheels and tires (obviously) and, the hub, which meant the removal of the brake drum too. Now, knowing that my air system leaks down, and, knowing that I had to order the hub seal and it would take at least a day and a half to get to me, I knew I'd have to periodically air the system up, to keep it from reaching the point that the e-brakes would come on automatically.
So, I tried airing it up through that shrader valve up front. Nope, wasn't happening. But, I knew of another shrader valve, right on the bottom of the air dryer. So, I tried that one, yep, that's the one that's used on my chassis to keep the system supplied to keep the brakes from being automatically applied. And, as such, it's the one used to air the system up so the brakes can be released if they've been manually set.
So, that's kind of why I said your statement is partially correct. No offence.
Scott
