He already mentioned using 6 point sockets...then again if they are cheapo worn ones then they have damaged the head from the start. ..so mangling bolts that are stubborn are the last of your worries...chuck the bolts and get some new...we talking about brakes not window wipers..it also depends on who fitted those brakes...I've seen people use cheap sockets made of monkey metal round a bolt as they fit it...and the next to realize that is the poor person removing it ..loctite muppets are everywhere...seen new Apr entices tighten bolts with there worn sockets and wrong grade loctite and wrong torque..and my irwin sockets removed the wrong doing where no other type will even sniff it .if you want heat on those bolts fly the tf to Cobber I bet it's hot over is side of the world