[ihc] Corvette Master Cylinder - which size bore?

[David Bongo <dbongo@xxxxxxxxxxxxx>]

My rear brake problems have PROBABLY been resolved, but let me check 
with you guys on a detail.  I've got rear disks with a TSM kit, and the 
culprit probably was the residual valve in the master cylinder.  That 
has now been swapped out for a Corvette one.

When I called TSM yesterday (and before I got Jim's message) they said 
that either the 1" or 1 1/8" bore would work, but the 1" bore would be 
better for my application (mail delivery in a Scout II).  So, when my 
mechanic ordered the parts (I won't do that kind of brake work myself. 
Period.  I'm a bozo-level mechanic at best, and in my line of work you 
can't play games with brakes.) I said that either would work, but TSM 
recommended the 1" bore.  I know they got it and it bolted up to the 
booster and it's all good right now, but I don't know which one they got.

Jim Grammer says to "...make sure it has a 1 1/8" bore."  Why?  And what 
problems might I expect if I do have the 1" bore?  The thing cost all of 
$35, so replacing it won't kill me financially, but I'd rather not spend 
the money if I can avoid it.

Thanks in advance.