Some swear they do not work, others like myself have never had to re-adjust them. My two 1993 Lightnings worked just fine. My 1992 F350 had butchered rear brakes but once I fixed them they worked like a charm.

YMMV

 

I will go out tonight and reserve and slam on the brakes to see if that works. If not then I shall replace the wheel cylinders and brake lines. Gotta do my coil springs and ujoints as well

 

One thing at a time. Remember, if the shoes are not manually set close to the drum "light drag" the first time, the self-adjustment feature won't work. Ever.

The self adjusters too, even when they work, get corroded up from salt spray and brake dust and such. They need to be cleaned up and high temp anti-sieze applied on the threads. They get HOT in there, petroleum grease will just turn to glue or varnish probably.

Slamming on the brakes isn't quite how it works. They do operate only work when backing up. Technically, backing up braking "sharply" and then going forward a few feet, is actually what does it. Repeat 4 or 5 times. It's the wear on the shoes that gets taken up, one click at a time. Don't look for a huge improvement or anything. They must be setup right initially to work at all. Hope this helps.

 

Oooh okay. I'll spray brake clean, clean it with a clean towel, apply high temp grease and adjust them easy enough