We are trying to get things ready to go to the SC Southeast Busnuts Rally, and I have had an ongoing issue with our wipers. They are still the original air wipers and they had a habit of quitting whenever they felt like it, and more recently just quit altogether. I've been wanting to get the ones that were on sale at Silver Eagle Mfg., and when I finally called them to try to order some, I could never reach anyone at either location (TX, nor TN), so I talked to someone at the local bus repair shop I use and he suggested it might be the air regulators (also called the wiper valves) that has gone bad. I called Norris at Jefferson Bus in OK, and ordered two regulators (part # 154-1251-502) one for each side. It took me about an hour to install them, and that seems to have done the job. The old one that I removed from the driver's side had the date of May 1979 stamped on it, and the passenger side one was stamped 1989, so no wonder they were acting up! Here are a few pictures:
View before installation:

New valve:
