This statement is partially correct.
People always assume that ABS decreases your stopping distance, this is false.
It just allows you to maintain more control over your vehicle during an emergency braking situation.
Your normal brakes will still function normally, but just no ABS.
So if you do have to slam them for some reason and you start to hear the tires skid, start pumping furiously.
In all honesty, I would take it to a shop and have them diagnose the issue you and have it repaired.