Brakes have me baffled!
If it makes any difference, here's the master cylinder I've got:
http://www.magnumhp.com/showdetails.php?ITEM=MAG-1
It's an aluminum unit with a 1-1/16" bore.
One other thing - I had to use a 4 to 2 bolt adapter (this one:
http://www.magnumhp.com/are-02.jpg
). Is it possible that my pushrod is too short now?
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