The brake system, known as " Hydro boost, " the steering pump does provide assistance for steering and brakes.
Running low on fluid can damage the power steering pump.
Some systems (chassis) have an electric pump back up to aide braking in the case of the main pump failure.
What chassis is your coach built on?
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.