I'm not sure there is a minimum disk thickness. Go until you run out of adjustment. If they are down to flat with the grooves and you still have adjustment, I suppose you could cut the original grooves a little deeper. There is still pad where the grooves are.
New pads are a hair over 1/2" thick. Maybe close to about 9/16".
If you got adjustment and pad left, I'd say your lucky. Those actuators only spread so much. At some point new pads won't work and you have to machine off some of the housing surface.
Part of the reason it may have broke (maybe) is that you are out of adjustment. The two actuator rods from the clevis to the disks pull tight against the housing as you adjust the ball up too much. Then the actuator disk spread has reached its limit. You will see that when you get the housing off. Let us know.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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