13mm, but use a socket that only has 6 faces. A ring spanner could burr the edges if they are a bit crusty!!;)
 
Just looked at RAVE - the Caliper bolts look single hex - but the carrier frame to hub are Bi-Hex possible in the 15-17 range.

EDIT: Looking at images on Goooooooogle - Aftermarket carriers use single hex and OEM use Bi-Hex....just to confuse the issue!
 
Ooer, I read that wrong....
Caliper to carrier, the carrier bolts are 19, using a regular socket.
:oops:
 
Where are you? If close to Bucks you're welcome to pop round if you need gas to heat it up.
 

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