I have a 98 VW Cabrio with which i drove in the snow for the first time today. I drove super slowly and a couple of times while i was slowly braking, the brake pedal would push up under my foot, in a sort of a loud vibration. My dad said that‘s what the ABS does for safety, but his car doesn‘t have ABS so I don‘t trust his opinion. The ABS light doesn‘t show up on the dash, but there is a light that sometimes is on the left of the sterling wheel.
If u're sure u don't have it then it can be that the brakes need alligning,one is getting hoter than the rest or simply said it can be the brake hydaulic system has some flaws.But this is more possible with ABS and the louder when some pads are not working in synch with the rest.
The other two answers are correct. When ABS activates, it rapidly pulses the brakes and you can feel that as vibration through the brake pedal. This is to warn you to not let go of the brake pedal, because that can have a negative impact on the efficacy of the anti-lock brakes. Depending on the car, the ABS light might flash while this is happening.
Nothing to fear. This is exactly what ABS does. It pumps itself very fast-- much faster than you could so you get that sensation. The ABS light in my cars does not go on when braking . If mine goes on it means a problem.
