Hello guys. Need to scratch some heads in here. Got a 2017 t590 that lost parking brakes. Unsure of the conditions on how. Unit was brought back with complaint it rolled. Sure enough it’s got nothing. Crank it up drop the bar and go. I’m assuming that they are spring applied hydraulic release ? Of course that’s my assumption they work similar to the rest. I can see one side possibly failing but both sides at once? Here agin I’m working under the assumption they are spring applied. Does anyone have any experience working on this particular system and might be able to tell me if that is in fact the case. Thanks guys