Safaris of that era were great coaches. It should be riding on the old Safari-built 8 bag Magnum chassis, which, aside from my Spartan, is one I have had experience driving, and it is a very smooth riding coach. I think the torsion bar suspensions ended in 1996 or 1997, maybe? It's easy enough to spot when you take a look
I've never been a fan of hydraulic brakes, but that said, for motorhomes, it's not a big deal, in my book, as long as you make sure you use the engine brake on grades (which is something you should always be doing!). With a C13 I'm betting it's got a two stage Jake -- so not just an exhaust brake, but an engine brake as well (if it has "high" and "low" settings on the toggle that should confirm it). With "high" I would imagine you'll never touch the wheel brakes even on 7+% downgrades.
I want to say that the axles and brakes are NOT Safari proprietary, but I am sure someone else more knowledgable will comment shortly. If you have documentation that says "Arvin-Meritor", or "Reyco" or "Granning" for example, those are common 3rd party suppliers.