I feel for you Bro.
I have the same problem with my forklift.
Mine is a V50E, with the same brake system.
I went completely through everything on the brake system, Too.
Beginning to think it is the master cylinder, because of the probability that the off shift did put brake fluid in it.
Would like the info you have from cat, or a link to it, if you can.
I will keep you posted as to any info, or remedy that I find out.
Thank you for responding, and I will help you all I can.
Again, Thank you. I appreciate you help.
William