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Author Topic: 76 CB750F rear master cylinder  (Read 4626 times)

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Offline KRONUS0100

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76 CB750F rear master cylinder
« on: July 28, 2010, 09:13:41 AM »
have developed the no rear brake syndrome.  Does anyone know who currently has rebuild kits for these or maybe what newer sport bike master cylinder will swap in?  The caliper appears to be fine....no leaks in the system....just no brakes..and they have been bled. Bike is a 1976 CB750F Super Sport.
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MATT
current bikes:  1976 CB750F, 1981 GS1100E
bikes owned:1981 GL1100I, 1990 GS500E, 1981 GS850, 1977 and 1979 GS750, 1974 CB750, 1975 CB750, and a 1982 GS750E

Offline Dunstall_74

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Re: 76 CB750F rear master cylinder
« Reply #1 on: July 28, 2010, 09:21:02 AM »
K&L makes a rebuild kit. K&L part # 32-1458 they can usually be ordered through any reputable Motorcycle shop.  Or you can just buy one online
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: 76 CB750F rear master cylinder
« Reply #2 on: July 28, 2010, 09:33:48 AM »
Still available from Honda as far as I know. I buy from www.servicehinda.com. ~20% discount but the order I'm waiting on had a $20 shipping charge so it was a wash.

Are BOTH caliper pistons free and not stuck? Those parts are available too. No leak past the master cylinder piston! Not sure if this makes sense to me. Hummmm, our rear brake should lock up the rear tire in a heartbeat.    
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As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline Steve F

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Re: 76 CB750F rear master cylinder
« Reply #3 on: July 28, 2010, 09:44:31 AM »
Quote from: Jerry Rxman Griffin on July 28, 2010, 09:33:48 AM
Hummmm, our rear brake should lock up the rear tire in a heartbeat.    
Oh, YES it does!!!!  They over-engineered that rear brake..or should I say "overkill"?
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Offline KRONUS0100

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Re: 76 CB750F rear master cylinder
« Reply #4 on: July 28, 2010, 02:58:00 PM »
really...then in the 8 years i've had this bike its been adequate at best.  It has always felt soft compared to the 78 CB750F dual fronts i run.  but....no leaks.  and it has no air in it....have had a 12 pound sledgehammer sitting on the lever all day .....it will stop the tire from spinning when in nuetral on center stand...but wont stop the bike out on the road....front brakes do all the stopping.
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MATT
current bikes:  1976 CB750F, 1981 GS1100E
bikes owned:1981 GL1100I, 1990 GS500E, 1981 GS850, 1977 and 1979 GS750, 1974 CB750, 1975 CB750, and a 1982 GS750E

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: 76 CB750F rear master cylinder
« Reply #5 on: July 28, 2010, 04:50:55 PM »
Seriously over engineered. Probably why the 77/78 have single piston. Too bad it wasn't put on the front. You may consider tearing the caliper down and checking into it. Another issue could be the brake hose. That is NOT available from Honda but aftermarket is out there. Are you close to another 75/76 F that you could compare to?
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As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline KRONUS0100

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Re: 76 CB750F rear master cylinder
« Reply #6 on: July 28, 2010, 05:39:50 PM »
currently running braided stainless lines front and rear from dennis kirk......so its not the lines.  I just had the whole thing apart about 30 minutes agao......caliper still on workbench....no leaks....pistons move freeely......just super soft application.....and dont know of any other Cb750F near Monrovia, Indiana.
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MATT
current bikes:  1976 CB750F, 1981 GS1100E
bikes owned:1981 GL1100I, 1990 GS500E, 1981 GS850, 1977 and 1979 GS750, 1974 CB750, 1975 CB750, and a 1982 GS750E

Offline KRONUS0100

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Re: 76 CB750F rear master cylinder
« Reply #7 on: July 28, 2010, 05:40:48 PM »
had a thought...there is a threaded adjustment rod on the master itself.....what is correct adjustment on this rod?
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MATT
current bikes:  1976 CB750F, 1981 GS1100E
bikes owned:1981 GL1100I, 1990 GS500E, 1981 GS850, 1977 and 1979 GS750, 1974 CB750, 1975 CB750, and a 1982 GS750E
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