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Fellas. I just moved my heavily modified 5 Ton M 818 from Wisconsin to Colorado on a 53' stepdeck. When it landed in CO I needed to move it three miles up the mountain on a Jeep trail. During that operation I noticed I was spewing coolant and I believe it was coming out the Petcock that feeds...

With the airpack theory, wouldn't they just feel really rigid vs. locking up?

If I manually pull the peddle back up they should unlock if a peddle return/adjustment issue, correct?

That is an interesting thought but pretty tough to trouble shoot and diagnose. I have torn down all 6 hubs for rebuilt and cleaned brake mechs and they don't seem to be rubbing abnormally. They are either completely free or locked, nothing in between.

Looking for help. All six hubs lock up with brakes and stay locked. First foot depression is soft then locks up hard and engaged. Dropping air does not release, only letting sit for awhile does. Can be driving down the road, not touch brakes at all, and brake lights come on and they lock up...