I have a Fiat Seicento and while changing the front wheel one of the bolts which holds the wheel on sheared?

Now I only have 3 wheel bolts in. They aren't nuts which fasten onto studs but are bolts which screw into the part that the brake disc is fastened to and which I don't know the name of .I'm more worried about how difficult/expensive it will be to get the broken bolt out than driving on 3 bolts Any ideas pleaseI have a Fiat Seicento and while changing the front wheel one of the bolts which holds the wheel on sheared?Yep, did the same to my mates pug GTI. Take it down the mechanics they'll drill it out for a couple quid then its just the cost of the replacement. You should be fine taking it at low speed with three bolts till you get to there.I have a Fiat Seicento and while changing the front wheel one of the bolts which holds the wheel on sheared?Fix it as soon as you can, and keep an eye on it until you do. It's just a matter of having a mechanic drill a hole in the broken bolt and extracting it with an easy out, and then putting in a new one. Shouldn't be terribly expensive.I have a Fiat Seicento and while changing the front wheel one of the bolts which holds the wheel on sheared?With the wheel off you might just have enough of the broken bolt left to unscrew with a pair of vice grips.The part its screwed into is the hub,hope this helps,