[V6-12v] C4 caliper bolt size

[Kent McLean]

I'm replacing the brake pads on my '94 100 CS Avant, and I need to
know the size of the Allen-head bolt [1] that holds the caliper to
the carrier. The bolts are accessed from the inner side of the
caliper, in a hole covered by a rubber plug.

I did a web search and found "Torx", but pressing a clean sheet
of paper into the hole gave a greasy print that seemed to show a
regular 6-point hex opening.  A clear digital picture seems to
confirm it.  A 7mm Allen wrench fits loosely. An 8mm Allen wrench
doesn't fit.

I'm also thinking I'll need a hex-driver on a breaker bar, as the
Allen wrenches look like they'll break before the bolt loosens.

viel Dank,

Kent McLean
'94 100 S Avant, "Moody"
'89 200 TQ, "Bad Puppy" up in smoke