Going down into Skagway is a long 2-3 mile very steep run, that is where the rear brake shoes got hot enough ( on drum/disc systems the rear brakes are the first to apply, so with light application its the rears that are more activated) that the bonding glue came apart and 2 miles later after they had cooled down the linings spun in the drum causing all sorts of noise and bad vibrations when the brakes were applied, thankfully it didn't cause any further damage but did require that I had to pull the rear brakes apart on the side of the road remove the innards and clamp off the rear brakes, drove another 1000 miles into anchorage to order linings in.. I know an exhaust brake won't stop the vehicle but it may be enough to give enough assistance to take some load off on big down hill runs.. I also had serious brake fade going down some very steep curvy hills in Arizona.. And yes, I have brand new high temp. (Ate racing blue fluid) brake fluid ...I found a small exhaust system brake on Craigslist for $50 shipped, I can activate it with a simple electrically operated vacuum switch, coupled in with a nice bright red light on the dash when on.. I believe it will give assistance to the braking on long down hill runs, if it doesn't I am only out $100 at the most with installation but I will have gained more knowledge and thought outside the box from the people who say it won't work...selecting a lower gear on hills like this one only serves to over rev the engine, diesels don't offer sufficient engine braking on their own.... Hence a lot of trucks have exhaust brakes, jake brake, Jacobs brake, engine brakes etc etc, I have to think that there is something to their ability to aid in braking...or is the whole trucking industry under false beliefs..???