One should take D100 route (also known as E5) and then Kurtköy side-route on arrival to Pendik turn. See the map for following route. Click on map image for a larger view.

Public Transports:

From Kadıköy : Busses numbered as 16/K pass by AKPET Gas Station which is 150 mt nearby.
From Pendik: Mini busses (blue ones) labeled as Pendik / Kurtköy pass by AKPET Gas Station which is 150 mt nearby. (Make sure they use "Kurtköy Yolu" route.)