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Hi Tim - We've had that problem too. Ours have the dry brakes, with actuators with 5 and 6 balls, and both types have given us grief. Big Dean suggested checking first to be sure that the balls are not moving up the ramps and onto the flats. Worn linings, worn actuators, reamed out friction surfaces in the axle housing and differential carrier plate can increase the clearance so this happens. Since you have had them redone, this should not be the cause; you'd have to remove the axles to see for sure. (The balls leave tracks where they travel.) It takes quite a bit of actuator rod travel for this to occur - you'd have to tighten the adjusting nuts probably half an inch after the free play is taken up if this were the case. On our last problem, everything was new 50 hours previously, except the castings, and the @@##!$%# thing did it again last fall. We took the axles off, cleaned everything, sanded the castings to remove the shine, reassembled, and so far, no complaints. But - after talking with Big Dean, he says sometimes they had to resort to a fix - installing return springs from a super 90. We've ordered them from MF. I think they can be installed by removing the blocks which carry the actuating rod boots. Hope this helps.
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