Vehicle was under recall and service was completed at gm dealer mid october. following recall for brake vacum pump and new computer program, i lost my brakes on several occasions at slow speeds in reverse and forward. vehicle was returned to dealer and after two days of testing vehicle would not duplicate issue or provide a code. dealer returned vehicle. that day 11/05/2019 brake failure occured on two seperate occasions backing out of driveway on grade. upon contact with dealer advised they would not do anything further until a code was provided. if i wished to replace the ebc vacum pump it would be out of pocket. vehicle has been driven daily until another appointment can be made. on 11/13/2019 brake failure occured again on two occasions. when failure occurs pedal goes to the floor and what sounds like abs noise is active with a pulsation in the pedal. vehicle will not stop and have to use e-brake to come to a complete stop as braking distance is dramaticly reduced. a follow-up appoint will be made with gm dealer again.