It's a petrifying situation to be in when you're driving fast on a freeway or highway and suddenly realise that your car brakes have failed you. A situation like this is not only a direct threat to your life but also to the people in your vicinity. Fret not, there're ways to avoid a catastrophe in case this were to happen. First of all, do not panic. Sounds like rhetorical advice really, but the truth nonetheless. The first concern that needs to be on your mind is to have it present and calm enough to take care of the situation.

1

Remove your foot off the pedal and switch off cruise control.
Obviously, you need to relieve from accelerating the car and if you're vehicle has cruise control you will have to switch that off too.

2

Pump your brakes if the pressure feels low.

If the brakes are loose when you press them it might indicate low fluid, in which case you could pump the brakes to rebuild pressure. This may take a while, so keep trying. If you feel like you might have built enough pressure, regardless of whether your car has ABS, press down on the brakes all the way to make most of the built up pressure.