What tool for Caliper bolts ?

[Hugo Karasawa]

What tool do I need to disassemble calipers ?
The head is not Allen nor Torx.

[John Brooks]

I believe that’s a metric spline, like the velocity joints on a 911/912. I have one but I can’t remember the size. Most auto parts stores will have them in a blister pack in the tool section

[Martin Benade]

That is coarser than the 911 spline bolts, which I think are casually called double square. That may be hard to come by.
Definitely not a torx, but the right number of points. No Torx will fit well enough?

[Hugo Karasawa]

Torx did fit but rounds the edges and stopped using it

[Martin Benade]

Torx teeth are round, not square like you need. So I guess not close enough.

[Vic Skirmants]

Definitely not standard 356.

[Greg Bryan]

I usually replace the bolts when I do calipers with socket head bolts. They are not very expensive and are very close to a standard length. I also use Schnorr washers under the nuts

[Jon Bunin]

What tool do I need to disassemble calipers ?
The head is not Allen nor Torx.

Hugo, you need a RIBE Polydrive tool.
Just search for a RIBE tool, socket or key. The size you'll need is either M6 or M8.

[Hugo Karasawa]

Jon,
Thanks, that is what I needed to know.
I was not sure which one to use, Bristol, Ribe CV or Polydrive Ribe.