Really need help here I have a 2000 s10 blazer with both abs and brake lights on and an SRS code of U1041 "Lost communication with EBCM" Also have little to no pressure at the brake pedal. Replaced Master abs control module and pressure thing under it with used parts I know were working a month ago. didn't happen till I replaced the rear end.

 

Most 4x4 blazer models will have 4AWL speed sensors. Two up front suspension and I believe one in the rear end and one on transfer case. If u chged the rear end u may have disconnected and not reconnected abs vss. I would start there first.