Issues with front breaks on 76 750f

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Issues with front breaks on 76 750f

Gedward
The piston clamped down while on a ride the other day.  Today I pulled the calipers apart cleaned the piston, bleader nipple, replaced the copper line and lubed the moving parts.  Put it all back together and couldn't get enough pressure up to bleed it or push the piston even a little. I'm thinking it's the master cylinder.  Now the question, rebuild kit, replace or take it to a pro since breaks are kinda important and I'm a 100% novice. Thoughts?
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Re: Issues with front breaks on 76 750f

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Since the master cylinders are, so small they do not move much fluid. this makes it hard to bleed them. I use a pump type oil can, and a piece of rubber hose to bleed them. Fill the can with break fluid, and attach one end of the hose to the spout on the can. Attach the other end to the bleeder. then pump the fluid up to the master cylinder. Best way I have found to bleed the breaks.
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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)