New here and I need some advice on a repair issue.

I have been having a problem with my hubs over heating. My 2014 Great Dane has been in the shop for three weeks now. Every time they say its ready I pick it up for test drive only to find out that the hubs are still over heating.

work done so far:
new brake shoes and drums both axles
new cam bushings both axles
brake adjustments several times
backing nut off to take pressure of bearings
repacking axles with grease
bearings checked -good
spindle checked -good
s cam checked -good

From what I can tell it seams to be a shoe rubbing issue. I noticed uneven where of shoes. Also the shoes seam to be wearing faster on the edges then the middle of shoe. Also also did a brake adjustment myself. In fact I backed them off completely on one hub just to see if it would heat up on a test drive. I stop and checked them after 5 miles. Hubs hot again and the brake shoes that I backed off were sitting on the drum again.

Has anyone come across this problem before? Any advice would be appreciated. I'm at a loss here. Great Dane can't seem to figure it out either.

 

It would appear so but not both shoes seems to be either the top shoe or the bottom shoe. Is the diverter air valve easy to clean? Hate to give it back to the shop and loose another week.

 

Great Dane said my slack adjusters are good. Maybe i need to go get a second opinion at another shop. Talking to techs over the phone they say slack adjusters should ride shoes out not in when they go bad. My shoes keep going back in after every adjustment.

 

Techs keep telling me otherwise.... smh.