Without knowing yr ride and its mileage i can only suggest u look on some item.
-check your rim,if one is much more dusty than the other side chances are your brake piston is binding.most people call it jammed caliler.
happen to me on a kenari.brake was behaving weirdly.sometimes pulls to one side and it wont stop as usual due to the overheating pad caused by the jammed piston.
-check all the bush/joint.worn out lower arm can cause the pulling to one side if only one side is worn out.on some car,the wheel hub needs to be disconnected frkm the lower arm to test for freeplay.this is what i discover with my waja,annoying tok3 sound but when jack and shake the wheel with all possible position it it quiet and no freeplay.when i remove the lower ball joint to free it from the wheel it produce the sound and the freeplay.
-tie rod.on heavier car it will produce a knock on the steering wheel when u are going through wavy road on the side.jack the front end and shake the tire left and right.sometimes the rod is good but the steering rack internal gear is worn on.common on car which is frequently driven at speed on bad condition road.
-worn out suspension causing uneven weight transfer and pulling the car to one side.