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Old 05-21-2009, 02:52 PM   #1
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Help to ID tow brake system

I just purchased a MH that has some unknown type of tow brake system installed on the MH. I have no previous owner contact info. Maybe someone could advised me of the brand of system.

MH has air over hydraulic breakes. There is a small aluminum cannister (4" long x 3" diameter mounted to the frame, below the engine (DP). There are two small air lines on the cannister. One goes to a Tee fitting just behind the drain valve used to drain water from the air tanks. The other goes to the air quick connector on the back of the MH.

Thank you for any help.

Mike Stephenson
Lubbock, TX
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Old 05-21-2009, 03:54 PM   #2
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Hi Mike,
It sounds like an SMI (Air Force One) system. SMI uses the coach air to power the toad brakes. There may be other systems that also use the coach air.
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Old 05-21-2009, 04:10 PM   #3
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M&G Brake Systems use the same air quick disconnect setup as you describe. I have one on my coach but the air cylinder that goes between the master cylinder and the vacuum booster has to be installed on the toad as well to be a complete system.
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Old 05-22-2009, 09:00 AM   #4
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The air cylinder he is talking about is on the coach, not the toad, as is the SMI and M&G cylinders the other mentioned. This type of cylinder is used as an air reservoir on the coach when the coach has air over hydraulic brake system, so it could be most any brand.

Since the air line to the quick connect is NOT pressure regulated by the coach brake system, it would have to be a toad brake that uses coach air but is triggered by an electrical hook-up, typically to the coach brake lights, or an inertial switch. Both SMI and M&G would qualify for that, but so would some others. You could use any toa d brake that requires a constant air pressure source. That leaves out Brake Buddy and Brakemaster.
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Old 05-22-2009, 10:34 AM   #5
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That leaves out Brake Buddy and Brakemaster.
I have always felt that is a good idea.

Can not comment on air brake systems in this case though.. don't have one. Do know a bit about air brakes, but not this system.
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