We have an Airstream with tandem Dexter Nev-R-Lube axles. Dexter's interval to check the brakes for wear is 12,000 or 1 year. Our Airstream has 16,000, so I figured it was past time to do a brake inspection. I prefer to do as much work myself as possible. If you work on your own equipment, and make yourself become familiar with how it work, you are a lot better off handling problems when they arise. It took me hours to find the correct manual from Dexter then Googling for a demonstration video on how to correctly pull the hubs. There weren't any videos that showed the complete process, so I made one.