I'm just beginning to re-assemble mine and I haven't doen any pedals yet but it sounds like a hydraulic bleedout.
I bought this one and it's one of only 2 links I have. It has missing chapters
11 - Front aXLE DRIVE
12 - PTO shaft
13 - Service brake
14 - Parking brake
told the guy too, but I have no idea what he's done about it since. At he time he gave me a partial refund so I have no rocks to throw

The existing content is multilingual and is about 975 pages and a 125 mb file. Here's my screenshot taken when I ordered it.
Another very promising source was in war-torn Ukraine, but under the circumstances I didn't feel safe sending credit card info there. If he's o the level and able to deal, the man seems to have tons of manuals!
http://engine.od.ua
brovertek@gmail.com
If anyone has dealt with him I'd like to know too.
The parts manual can help some times too. I don't have a link any more but google for a manual
"Deutz Fahr Tractor DX 4.10-DX 7.10 Parts Catalog.rar", I think I got it from a guy in Viet-Nam, fast and straight-forward online deal ending with a PDF download (about 280mb).
HTH