Re: 98 Mustang Front Caliper Grief
Angle grinders are a dime a dozen....
Anyway, you may have to replace the caliper. The bolts can occasionally be worked loose, but damage to the caliper trying to remove the broken torx can be just as bad and cause uneven brake wear down the road which you'll have to replace it anyway, on top of buying a couple sets of pads and rotors needlessly. If you have a tap & die set you can use that. However, a lot of cheaper kits that you can get may not be able to handle the heavier steel if you drill out the torx and thread a hole for a new one.
I've never heard of JB Weld, but I'm sure if you googled your problem you may get a ton of possible answers that may work without having to get a new caliper.
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!