Who also read “100 amazing car secrets”?

Hello, there is someone here who can explain something to me from this cult book of car fans? As most probably know, it is about braking at 100%-falls in one point (e.g. in the terrain or when driving errors/accidents left off the road): 1) “Without ABS-cars can not be braked there – but at least not faster. 2) ABS cars, on the other hand, race down the slope faster and faster, even though the driver is fully on the brake (…if no ascent-dependent ABS shut-off is installed). You find the explanation for this certainly easy…but I am unfortunately “technical dippe” (.. always interested and reading a lot since the latest). Can someone explain this behavior to me again with their own words? Thank you and many greetings.