Tires rolling when moving tandems while brakes engaged?

Lol

 

Brakes are out of adjustment

 

You can grease the rails that the tandems ride on. In your situation back up to a curb, make sure that you pull your trailer mud flaps out of the way. Back up against curb to slide your tandems forward. To slide them backwards, use wheel chocks. Any grease will work.

 

The same as non self adjusting. If they are out of adjustment, they need to be adjusted for the time being and then replaced.

 

Release your breaks. Press as firmly as you can on your break pedal several times until you exhaust the air and the knobs pop out. Your breaks should now be properly adjusted.

If not, seek mechanical service.

Automatic adjusters go out of adjustment if you only ever lightly tap the breaks. They need hard breaking (preferably when the truck isn’t moving) in order to adjust themselves.

 

Is a brake chamber leaking now? Some Shops won’t adjust slacks if they’re out. Only replace them. You found the problem. Another cause could be a broken parking brake spring on one or more of the 30/30 chambers. Trailers have a Teflon pad on the sliding rails. They get worn out. Graphite dry lube spray is good normally. If they’re worn, a shot of anything pb blaster. WD 40, or even Diesel fuel before sliding helps. Grease will just attract dirt and grime.. A curb or wheel chocks good. I usually Unlock it get it rolling and hit the trolly bar. Usually works.