Your coach should have the Roadmaster R4R (rail chassis). You will have one of the following rear differentials: DANA S-150, Rockwell RS15-120, Eaton 15040S, or DANA 80. Because Monaco built those chassis themselves with outsourced parts from various suppliers, the braking systems can vary.
My recommendation is to take the coach to a Freightliner repair facility and have them determine which brake system you have. If a Freightliner repair facility is not available, an International truck repair center that repairs medium duty trucks will be able to determine the manufacturer of the discs. Both those manufacturers use those differentials in their products.
If the coach is out of comission, take photos of the differential with the ID tag clearly defined, brake calipers, the wheel lugs, the diiscs, and get the disc casting numbers and minimum tolerance information and pay one of these truck repair facilities a visit.
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