no idea on your specific coach, but most HD ABS issues are related to wheel speed sensors. Check the sensor (reluctor) rings for debris or worst case a failing or out of adjustment wheel bearing can cause the sensors to read inaccurately and throw codes.
I most cases that I know of, when the ABS faults it drops the jakes or the exhaust brake until the fault is cleared. Might need to keep that in mind if you live in a hilly area or rely on those regularly, hate to see it not work when needed.
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