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Air Force One Braking System
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You seem to have some confusion going on here about AUX air. The SMI Air Force one does NOT use AUX air from the Prevost. It uses air from the coach brake system. The only way to install it properly is to follow SMI’s instruction as posted on their web site and included with the AF-1 system. You tap the coach brake system for metering air and supply air. In no way do you use AUX air.
They supply everything you need. And BTW, it is not a “pump” it is a tank and valve. You need everything to make it work as advertised.
Total Coach Protection
Total Coach Protection exclusively with Air Force One is a process that separates and protects the air supply on the coach. To meet federal regulations (FMVSS 121) and chassis warranty requirements when using air brakes, the supplemental brake system must protect the towing vehicle air supply. Only SMI includes the components necessary to meet these important safety regulations. If the towed vehicle separates or the towing system fails, the coach air is protected. Air Force One is the safest air brake system available. No other air-operated system offers this level of safety and control. The Coach Air Assembly is pre-assembled and pre-tested for function and leaks. It’s compact size (approximately 12″ x 10″ x 6″) and flexible mounting options make securing to the coach with two 3/8″ bolts a snap. All fittings are included and are push-to-connect style DOT rated.
https://smibrake.com/Instructions/AFO%20Installation%20Instructions%2010192015.pdf
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You’re right about the air coming from the Prevost brake system. But what Prevost said is that their braking system, if it reaches 60 psi, will automatically kick in a check valve allowing air only to be pumped to the Prevost brake system and no where else. I’m certainly no expert and do consider myself a rookie which is why I posted on the forum and with some different views, called SMI and Prevost. The Prevost has a check valve just like SMI’s system. Again, I wouldn’t take my word for it, contact both SMI and Prevost. If they say something different, then someone’s not telling the truth and further investigation needs to occur.
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Tim,
Trust me……….Make sure the AF-1 is installed exactly as they suggest. I cannot say it any plainer than that.
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My M & G looks better every day.:)
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Roger that Jon…
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Mark can correct me if I am wrong, but my understanding is the same protection against air loss is afforded by the AF-1 system so it can have a failure, and that failure will not cause an air loss in any part of the coach primary or secondary systems.
Early AF-1 installations had mounting issues and as a result several owners experienced a failure of an AF-1 air line. That failure was a non-event because their system installation provided the same protection against air loss on the coach as the protection and check valves provide between the primary and secondary systems installed by Prevost.
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