I know this is late but better late than never!

Happened to me a month into owning my MK4 Golf. The lights turned on just after I took a turn a bit quick in some slush/snow and I slid a bit going through. I spent 20 minutes looking through my manual as to what they meant and then googling the issue and reading multiple replies. All I did was go to class, then at lunch drove it onto the street, got some speed, then braked much harder than normal.

What I had read online had said that some slush/snow had just gotten up into the ABS sensor and doing what I did would clear it all out. Worked for me perfectly and has never come on since! I'm now a year and two and a half months into owning this vehicle and love it!