brakes not stoping truck on 1995 Chevrolet S10

when brake peddle is pushed it is full and the engine revs up and truck speeds up momentarilly after long time truck will stop . and a air release noise comes from under hood no dash lights ror abs comes on

Asked by for the 1995 Chevrolet S10
sounds like a booster failure. have a shop verify it for you and get a bid.

what degree of diffaculty is this i have changed boosters on 60 model vehiks and do u think i should replace master cylinder also while im there