Check this out:
When I am braking AND i reach 6-7 km/h AND my stirring wheel is turned left (a lot or just 1mm) my ABS brake engages for 1 or 2 shots.....
Any idea?!?!?!!??!?!!?
check your lines and reservoir to see if you are losing fluid. Definitely sounds like the ABS sensor/system. you can try disabling it and seeing if your problems goes away. one way of knowing it is in fact the ABS.
here is a link i found to disable it. Try a couple searches and you might find someone that has had that same problem before. The ABS on our 4runners sucks and I like to have complete control of my vehicle and not a stupid sensor.