front caliper torx/star bolt

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griffchris
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front caliper torx/star bolt

I'm trying to remove my uprated front brake calipers (420R), they are loctited in place with 2 star headed bolts. I purchased a star socket set from Halfords today, and set to it - the E12 socket kind of fits, but its chewing up the bolt head, so I don't think it is the correct socket type.  The bolt head has a couple of markings - "10.9" and , I think, "BC".

From reading it appears there are "Torx" and "Torx plus" standards - not sure this is relevant, does anyone know what socket I need to get a proper purchase on these??

Thanks

Chris

Thanks Jonathan!!!

Jonathan Kay
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Do you want to upload the photos to this site or link to them on another server? Forum User Guide.

Jonathan

Jonathan Kay
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Don't think I've heard this mentioned before. Presumably you've found this sort of thing:

Jonathan

griffchris
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Thanks Jonathan, I've edited my post above to add a photo.  I looks like the E12 socket I have should fit but it is a wee bit loose and I don't want to round off the bolt head any further.  I am having to put a lot of force through it against the loctite.  E10 is too small.

Wrightpayne
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Sometimes tightening first is enough to crack the loctite.

Ian

Jonathan Kay
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I don't understand the photo: is it with the socket on the bolt? Or is it a female end of the bolt?

(AFAIK normal Torx male bits are identified with T. External fittings (male on bolt, female on tool) are identified with E.)

Could you add a photo of your E12 tool?

Jonathan

griffchris
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The photo is of the bolt head, not the socket.  This link here shows a similar bolt rather better.  Excuse the poor description, but it seems to be the rounded protruberance onto which the splines sit that prevents the E12 socket from sliding on far enough to get a really good grip.

As an aside, my calipers are different to the uprated front calipers shown on the Caterham parts website.

Jonathan Kay
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Got it. The fit should be very good, and I'd look for an external Torx Plus socket. And there are two families of those!

Do you know the source of the callipers?

Jonathan

griffchris
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Thanks again Jonathan.  Looks like the external torx plus as you say.  The calipers are the original calipers supplied with the kit as delivered to me last September.

SM25T
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The bolt location looks very odd from the photo. Seems to be right on top of the pads .... going into the caliper body. Quite a different design to what I expected to see ?
Mankee
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The calipers look radially mounted. Presumably there is a bracket to which the caliper is bolted and that bracket is fixed to the upright? Can you unbolt it from there, like "traditional" Caterham-type calipers?

Pooperlight R480-ish: was 484kgs/200bhp/160lbft, now 485kgs/233bhp/167lbft