Front Suspension Hub problems of the 2001 Chevrolet 1500

I was pulling into parking space and there was no brakes also happened when I was pulling out of parking lot of store . I took to gm dealer and was told that both hub bearings were loose and that is what caused me to lose all my brakes. I hit a concrete handicap sign was lucky not another car in front of me. Why would gm make a truck that would lose its brakes if a bearing was loose I am afraid to drive truck that the same thing might happen again and maybe the next time I won't be so lucky. There was no sign of anything wrong with the exception of 4 days earlier my abs light flickered on then off 1 time. Remained off after that.