ok, so i just tried to DIY changing the studs i wasnt successful that day so gave up, i tried hammering the studs so it will back its way out but it just doesnt move even a milimiter, i even tried hammering it with a 25pound dumbell and still it just stays in its place, i double checked and i'm not sure if its welded also originally at the front of the hub or its just an illusion caused by rusts or dirts on the sides of the bolt on the rotor.....could this be possible?or maybe i really need to hammer it with all my strength?
Installation may be as simple as pressing out the originals and pressing in the new ones. Probably requiring removal of the spindles from the car to put them on the hydraulic press. Or, if the backs of the studs are obscured, you may have to remove the hubs from the spindles, discard the wheel bearings (if they are sealed type bearings), and install new wheel bearings.
If they are in there anything like as securely as they are supposed to be, then it is going to require the use of a hydraulic press
. If they have rusted together, then it will require the press in addition to soaking in a rust eating penetrating oil, and possibly heating with a torch to break the bond of the rust between the two pieces of steel.
You may want to grit blast the rust away from the edge of the stud on both sides of the hub in order to allow the penetrating oil an easier path to get between the two pieces. If so, tape off the bearing area to keep grit from damaging it.