what's with the butter bolts they put in zuks? i've broken off a front housing bolt TAKING IT OUT ! and 4 out of the 6 hub bolots taking them out ! am i missing something ?
It must of been the front housing bolts on the passengers side hanger. I've twisted off a few of them. The good thing is, usually the bolts twist off with a little bit of the bolt sticking up above the housing. So you should be able to take a nut, place it over the bolt, take a welder, and fill the nut with weld (concentrating the weld on the end of the broken bolt). The combo of the heat from welding and the nut giving you something to put a wrench/socket on, usually makes it so the broken off bolt will come right out. Even if the bolt is slightly below the surface of the aluminum, the nut method will work, since the weld won't stick to the aluminum (although, it may mess up the outer threads a little and you may need to run a tap down the hole, to clean them up).
I've used the same weld-a-nut method on the hub bolts. But you have to be careful there, because the surrounding metal is steel and you can weld the bolt to the wheel hub. The trick is to use the right sized nut, or even one that is one size smaller than the bolt, so the weld won't "leak" out onto the surrounding metal.
Another trick with the hub bolts is to use wd40 (or similar) and spray the bolt and tapered washer down. Carefully try to break the bolt loose. Once broke loose, if the bolt starts to turn harder, screw it back in a little and try again (may have to do that several times, to "work" the bolt, before the rust and corrosion will get broken up enough for it to thread out without twisting off).
One more trick, is if the tapered washer is sticking in the hub and not coming out with the bolt (once you see a little big of gap between the washer and the bolt head). Take a flat screwdriver (or a chisel) and hammer and tap right between where the washer meets the hub. This will usually break the washer loose from the hub and allow you to remove the bolt without twisting it off.
I rarely use heat on bolts that are threaded into, or through, aluminum. Nothing wrong with using heat, I just generally choose not to and my other methods work just as good.