What Causes a B2 piston to break.
 

Out of curiosity, what causes a B2 piston to break? I spoke to a inde Mercedes Repair shop, and they say:

"Oh...Theres something wrong with the transmission because the B2 piston is seriously damaged blah blah blah $2,100 to rebuild trans or blah blah blah Something is broken in the trans blah blah"

Before the B2 failed my trans is shifting fine, it downs shifts and up shifts smoothly, and engages every gear properly. So back to the question, What causes a B2 piston to break?

Weakness at the dyaxial flange often causes this, luck of the draw.

which car?

My 1984 300SD, yeah it broke into 3 peices from the looks of the dyaxial flange failed... Thx goodness i am a DIY mech or i would have been overpaying for something small and cheap

can someone please explain this dyaxial flange in english? I always thought it was the metal bushing creating friction and grooving in the piston, then it would ultimately become too much to overcome and the thing would break from sheer friction or binding at the bushing. This is why they updated the bushing with a nylon piece so that it will not gouge the B2 piston.

Worried that someone else was going to break on my car, I googled "B2 Piston" and found this:
http://www.mbz.org/articles/transmission/b2/why/

(you gotta scroll way down for some reason)