[Richard]

From what I can see in the photo, the hose assembly and install are less than optimum. How about that for political correctness.

You need two things to fix this. The first is an EZ Out to get the broken fittings out of the brake chamber. The second is a new BRAKE hose. Measure the one on the other side, and take that measurement to a fleet pride or similar store, perhaps even NAPA, and tell them you want an air brake hose. They will have a rack of premade hoses with appropriate fittings on each end.

Now here is a trick that will make this way easier. The premade hoses will not usually swivel. So threading both ends without twisting the hose is difficult. Remove the two bolts that hold the brake chamber to the caliper. You can now turn the chamber as you thread the fitting. Reinstall the chamber after the fitting is tightened. Use tape or dope, your preference.

This is an easy fix. Be sure to crib the coach while working in the wheel well.