If you haven't already done so, pull the springs that hold the expander halves together. Take some sand paper, and by hand, sand the ramps that the balls ride in. The other area where they can "drag" and not allow a release is the three areas where the expander circumference touches the "hat". Sand the surfaces of the expander and of the "hat" where they touch. Don't know what others use for lube but I use a hi temp grease to lube the balls and ramps and where the expander touches the hat. Also lube all linkages. Yes the "hat" can be milled to tighten up the clearance, don't remember how much though.
Anyway, that is what I did for my 560 and the brakes work well and do not lock.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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