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Old 07-25-2011, 05:35 AM   #43
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Originally Posted by Iron Man View Post
What chassis have a breakaway valve? Spartan sells an optional tank for tieing into their air barke line. Spartan will tell you not to connect to the air brake system unless you use their optional tank.
I'm surprised any chassis manufacturer supports a break away valve for the towed vehicle. Perhaps this valve is sole to protect the air system on the coach when the air line to the towed vehicle is broke or otherwise has a catstropic failure.

The break away system must be solely contained in the towed vehicle to actually work. Of course there may be a trigger mechanism attached to the RV, just is common with the tether cable that activates the towed vehicles break away braking system. In the case of the SMI AF1 system and I believe the same to be true of the M&G they contain a small air tank that is supposed to have an adequate supply of air to apply and hold the brakes on the towed vehicle.

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Old 07-25-2011, 06:52 AM   #44
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It's not a true breakaway valve, however the aux tank is set up so that it won't draw excessive air out of the main air system. Very much like a tractor protection valve on a semi-tractor. Even on the older Spartans, which did not have that, there's no way that a torn hose would affect the coach air system. I've tested and proven that for my own piece of mind.

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