I just experienced this. I got a repair done on my handbrake yesterday (it was not holding on sharp inclines before, would slip with clicking sounds). So I wanted to test this and took car on a sharp incline and my engine stalled as I was in high gear. My first action was to apply the pedal brakes. I pressed the pedal and nothing. It felt like car is just rolling freely. I then applied hand brake and that did put some resistance but the car still rolled back.
I managed to get it on a level road and tried the foot brake again and they wouldn't work. I then stopped the engine. After like a minute I turned it back on and I could use the brakes again.
I drove it back home slowly and didn't feel anything odd in the foot brakes. But I am not confident at all in them now.
Can someone please suggest what could have gone wrong that the brakes went off and came back in a minute.
The car is a Fiat Punto evo 2010. It has ABS and I have recently bought it used. I have had some issues with the hand brake on sharp inclines before(with more load in car) but never with the foot brakes before.
Also, no warning or danger lights were illuminated on the dash when this happened.
Update. Probably this is important. The ground was slippery and was covered in small stones (very small gravel like)