Air is better. But we have had a few IH trucks with wet brakes with little problems. Just more stopping power with air.
x2 air is better but if the price is right I wouldn't be afraid. Bobtail or tandem?
its a bobtail. The guys asking 4500.00
would not be afraid of hydro brakes air brakes can be better for more power but usually hydro brakes are fine for most hauling on level ground if you are in hilly area strongly consider air brakes