Volvo Kombi 850 Problems with the ABS

Hello guys, because my Volvo Kombi 850 1992 (is a bit opaque, built in 1992, first registration 1994 ?) thanks to the forum again runs the next problem pushes itself into the foreground. The ABS “rupt” while braking …. somehow front That started very slowly and gets worse, the TÜV did not disturb it. You notice that only if you drive slowly and brake otherwise it brakes easily. Unfortunately, the “pick-out” does not work anymore, shows still digitally … but does not start t. The ABS control unit is already an replaced used part and has been in it for 2 years. Theoretically, I could try to exchange the ABS sensors with my English manual Makes sense ? Greeting Robert