someotherguy
+1y
Hydroboost makes no difference, that's just the booster function, bleed procedure is the same as if it was a vacuum booster or not even power brakes.
If you can't get any fluid to flow then the flex hose is probably collapsed inside, if you replace them, replace both. May not be the problem but it's cheap and easy and they DO go bad.
Also, could be crud buildup in the calipers if the brake system has been neglected. Brake fluid absorbs moisture from the air (your master cylinder cap is vented) and most people never flush out their brakes, ever; water builds up and corrosion sets in. If your calipers are ancient, you might find they're the problem, too.
Richard