hi, can anyone help, the gears on my 04 110 td5 are almost impossible to engage. wife had the rac man out the other day whilst i was at work and he found no clutch fluid, he topped it up and bled system and it was marginaly better but now back to near impossible again. fluid is quite dark and i have tried bleeding system but got no air out. im thinking either slave or master cylinder but not sure which.cant see any fluid leaks.i might try slave cylinder first as this looks easiest and cheaper, but have read about the pushrod coming out. is this likely. any tips or advice will be appreciated. its our only vehicle so it needs sorting quickely.
many thanks.

id change both ,seals in either wont have liked working in contaminated fluid