Wow, well at least you found the problem. I had the same, "broken spring" problem with my 85TD a couple years ago. Someone will know which disc, I've only have experience with the W123s.

Sounds like you have the right tool to push that brake fluid UP through the system. I was thinking a grease gun (new) would work pretty good too. One guy here used giant veterinary syringe.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"