I wasn't intending to suggest any bolts... just trying to identify the head. Or did you mean elie?
If the head's too chewed up to use the sockets when they arrive...
1st option would be to weld an old socket on and turn that off. If no welder available I'd grind the head off, withdraw the caliper over the remaining shank then turn the lower section out afterwards. Once the clamp of the bolt head is released the rest will probably turn out with your fingers. If you try and use an easyout before releasing the clamp you'll probably just snap it and have a whole new problem.
On the subject of replacing the Torx + with cap heads or hexagons, does anyone think that would be an issue?
From what I've found out Torx heads were originally designed to enable greater torque to be applied to Phillips/Posidrive type screws, because the Torx resists 'cam out' better. They were also used as tamper proof fixings when Torx tools weren't so widely available and that was the original use for the male type Torx bolts. They have no advantage in terms of torque application over a cap head or hex head.
So there seems no reason at all why these particular bolts couldn't be replaced by cap heads or hexagons, assuming, of course, the same thread and material spec is used.
I had never heard of Torx plus and would have had exactly the same trouble if it makes you feel better.
So, an update: The Torx Plus sockets arrived, they do seem a better fit than the standard Torx - I was able to get one of the remaining 2 bolts out of the caliper using the EP12 socket, unfortunately the last bolt head was too far gone to get purchase and I ended up having to drill it out etc - lesson learnt! I replaced the Torx bolts with cap heads as above, I had no luck in locating the external Torx heads even if I had wanted to replace like with like, Caterham parts have not been able to come up with them either.
As an aside, the reason I wanted to take the calipers off in the 1st place was so I could thoroughly check the front wheel bearings, having read previous posts about a lack of grease applied at the factory - sure enough there was very little grease evident, so I packed them as best I could! I've only covered a couple of hundred miles so far so not too much harm done I hope...
Do you mind saying where you got the sockets from?
From Amazon, here
Err - not exactly. I ordered a EP12 socket, and still destroyed the bolts.
Cap heads ordered.
My detailed build blog
I will also need to remove the calipers as the wing stay prevent the pins that hold the pads from being removed.
Just want to be sure that the socket set mentioned from Amazon is definitively the right one?
Also anyone know what torque to reset the bolts to?