Loud pop, no brakes sounds like maybe a flex line. With todays split master cylinders you shouldn't lose all braking. If a front line went you would still have back brakes, but they aren't nearly as effective as the fronts. I had the front to rear line blow on an Exploder and the pedal went almost to the floor but I still had effective front braking, it was just a little unnerving
If the master cylinder blew, it may be an internal seal/O ring and you may not see any visible signs. Check for brake fluid splashed around and if you see any on painted surfaces wash it off right away, that stuff will strip the paint clean off.
Needless to say don't drive any further.