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Found alternative CB750F rear master cylinder rebuild kit.

Daren

Daren
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To all those which have searched for an alternative rebuild kit for the
75/76/77 CB750F series rear master cylinder know they are hard to find
and expensive when you do find them, I rebuilt mine with the kit designated for the GL1000
Honda part #43510-371-305. It's exactly the same as #43510-392-305.
Just the plunger is a little longer, easy fix with a cutoff tool.
It's so nice to not have a small drip of brake fluid under the bike anymore.
Rejoice, dance in the streets, pop wheelies in your birthday suit, snap your suspenders,
and throw your hats in the air.
(SHHH, I think I'll buy another kit before these get rare too.)

rebuild kit comparison_2.jpg rebuild kit comparison_3.jpg rebuild kit comparison_4.jpg rebuild kit comparison_5.jpg
 
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Hope it helps, let us know how it turns out.
Unfortunately sometimes the master cylinder
is shot and a rebuild kit won't do the trick.
In which case it's easy to make a bracket and attach
an aftermarket master where the old one was.
 
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