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Aux Air
I reviewed all your videos … great job!
I have a question, I know there are front/rear brakes and an emergency brake. But on several of the videos you demonstrate how the auxilary air pressure functions when the F/R air pressure builds over 75psi or so.
What’s the purpose of the auxilary air? Is it for the rest of the pnuematic mechnicals in the coach, or for the airbags, or is it a backup for brakes or some other purpose?
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3 Replies
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Aux air is used for the air suspension, any converter added items such as air operated pocket doors, step slides and the driver’s air seat for example. It is not used for brakes, and the chassis air system won’t fill the aux system until the brake system reaches at least 75 psi. The brake system has priority.
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Aux air is also used for tag lift, and mini air bellows for belts on engine, and to open and close front shutters air lock on door going into coach and a few other things
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Simply stated, aux or accessory air is anything that is not brake related. As such until the brake system has been satisfied with about 75 PSI the system will not allow any air into the aux system.
As a driver it should be understood that anything that causes a loss of air on the brake side, such that maintaining the 75 PSI is difficult it is an emergency and continued driving is not advised. Our air pressures are normally going to cycle from around 90 PSI to 120, but if anything occurs that takes our air pressures on the aux or brake side out of that range such as a failed emergency brake diaphragm to a failed air bag, or a valve that has failed open the immediate reaction needs to be to get the coach to a safe place. Problems do not repair themselves, and generally get worse.
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