Grant,
Welcome to BAC... I hope you are filling the brake reservoir with DOT 3 fluid and NOT power steering fluid. I am a little confused about what BCS told you regarding the hydraulic (using the power steering fluid) assist braking system on your coach. The system on your coach (I think) is air over hydraulic (brake fluid). If so, the assist is coming from the air pressure, NOT the power steering fluid. Anyway, you should empty the brake fluid reservoir, refill with fresh DOT 3 fluid, bleed right rear, left rear, right front, left front and refill the reservoir. Also, it is very important to clean/lubricate the front and rear brake slides.