2008 Chevrolet Trailblazer brakes problems

While driving the 2008 trailblazer I started to experience a loss of brake pedal with the travel going all of the way to the floor, with hardly any braking function or stopping action. It was intermittent and would not happen more then once or twice at first. Then when I was in a parking lot, the brakes failed again and I hit a cement divider damaging the bumper of the vehicle. You would be driving the vehicle, and step on the brakes as you would be coasting into or coming up to a stop.

Tl* the contact owns a 2008 chevrolet trailblazer. When the contact attempted to accelerate at a traffic light, the brakes would not disengage. He attempted to release the brakes by shifting gears and apply constant, steady pressure to the brake pedal. Within a few minutes, the brake released. On a separate occasion, while driving at speeds of 15 MPH, the brakes locked. He abruptly depressed the accelerator pedal in an attempt to avoid a potential crash.