The issue is simply front brakes can easily lock up and that happens on the front end especially if you get on a washboard or bumpy road. believe you have the new 15 gal tank that I helped IM source out to give my car at the time a larger trunk with two radiators. This helps by adding weight to the front of the car but some people keep tools or have even added plates (metal) to their front end to add weight.
When it happens it is a bit annoying if you have to suddenly stop and the front locks up, and the tires chirp. ABS? Maybe someone with experience with an older 911 from that age can comment if there is an issue with those cars as well.