lost my newly installed brakes from shell customer cradle... :(

[chilly]

I just had an accident this afternoon.. lost my brakes while i was driving downhill at the flyover of edsa ortigas. I hit another car. It was really odd because my brakes are newly installed and adjusted last saturday. I don't know if there was something wrong with the way it was installed or adjusted. Is it possible for the brakes to be working fine for 6 days and all of sudden lose it?? need your advise asap.. I need to file a complaint if need be.