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I hope I am not posting to much, But I am working on my 75 and just keep running into things.
Just rebuilt the front brakes and cannot get any fluid to pump out of master cyc. Kit was put in correctly.
Question though. Are both the small holes in the bottom of the master cylinder supposed to be open.
Just my rear is. Thanks for the help guys
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Administrator
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The best way to bleed the brakes is to force the fluid in the bleed screw on the caliper up to the master cylinder.It does require either a special tool,or you can home-make one.It's really the only way to do it IMO.I did my front brake like that.It took about 2 minutes.
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Administrator
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No, your not posting too much. Since the master cylinders on bikes do not move very much fluid it is hard, for them to push enough fluid to bleed the system. Also the air is wanting to go up. I bleed them with an old pump style oil can. I fill the oil can with break fluid, then I attach a piece of vacuum hose to the tip of the oil can, and the other end to an open bleeder. I then can pump the fluid up to the master cylinder. It is the only way I have found that works.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."
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)
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Administrator
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See now that is odd. I filled mine from the top. It did take a few minutes to make it to the caliper but not too long.
Both holes in the master must be clear. I fill my master, and slowly pump and each time I pull the lever, I hold it for a bit. While the other guys have what sounds to be a better way, it took about 5 minutes to fill the caliper. From there, it was standard bleeding.
The ride IS the adventure. The destination is just to get gas!
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Okay guys, I tried the pump can method. I tried the bleeder screw first but kept spraying
out around it. I then tried the line but couldn't get any fluid up. My can may not be putting
out enough pressure.
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Administrator
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Try twisting a piece of mechanics wire around the hose, or a small hose clamp to hold it tight. Also is the bleeder clear? sometimes they plug up. I clean them with a drill bit.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."
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)
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am i the only one who bleeds them like a car brake system? just get a mate to pump the brakes for you get him to hold the brake leaver and then open the nipple and close it fast and re do it pump relase and repeat, words i have chosen to live by
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Administrator
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I have never tried it the "traditional way".so i'm not gonna say it doesnt work.I imagine it does.I used one of those special pumps made for reverse bleeding.You can get a decent one for about $20.I did have to put a fair amount of pressure to pump it up,but not much.Pretty much all the resistance you have is the weight of the fluid in the system.If you are using one of the old school oil cans where you just click the bottom with your thumb they dont move a lot of product.I think the oil can pump that Tools is using must be the style with the trigger.They shoot a pretty decent stream.But if yours is squirting around the bleeder volume must not be your issue.I would double check for blockages,make sure the hose youre using is good and tight and try again.JMO
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Did the rear that way,didn't need 2 people. 
1977 CB750 F2 Super Sport
<LET THOSE WHO RIDE DECIDE><RIDE TO LIVE-LIVE FOR JESUS>
Native American from central Cal, Kickstand UP in S.W.Missouri,
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I'm going to give it another shot tonight. My pump can is not real big, but does shoot a decent stream.
I can not get any fluid to move out of the master cylinder trying the traditional way. Not even a drop.
I thought I might have put the kit in wrong and have had it apart twice. everything is in correct. I have bled plenty of brakes before and with the vacuum bleeder. So far I am having no luck.
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Administrator
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Are the two holes in the reservoir clear?
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."
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)
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Sidebar: I use SpeedBleeder's. Will never use anything else on my bikes. Too simple, too easy. Makes flushing out the old fluid as easy as pumping the lever, and topping off the reservoir. Changing the fluid is a one-man job, and it only takes 20 minutes, or less.
1979 CB750K (sold, 2012, but not forgotten)
1983 Kawasaki 440 LTD Belt Drive (sold, 2011)
1993 Kawasaki Voyager XII
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Administrator
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Must be magic. I'm getting ready to do the front brakes on Avenger II, and this will help a great deal. Thanks, Sarge, for sharing.
Luke M
Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.
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Tools,
The front hole was clogged. I did get it back open.
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Administrator
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Can, you blow air through the line? It might be plugged. It does take some pressure to push the fluid up, but it should go.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."
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)
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Well Finally got fluid down to caliper. I am still getting some pressire leakage around the line
where it bolt to the master cyl. I have got it pretty tight.
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You may need to replace
the Copper or brass washer,this softer metal works as A gasket. 
1977 CB750 F2 Super Sport
<LET THOSE WHO RIDE DECIDE><RIDE TO LIVE-LIVE FOR JESUS>
Native American from central Cal, Kickstand UP in S.W.Missouri,
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This post was updated on .
Everyone did not answer your question.
The answer is YES, both holes in the master cylinder resevoir MUST be open.
The large one will be open because its, well large.
The other one must be open but is a very small hole but if it is
clogged no fluid will go down the large hole.
IT is like holding your finger over the end of a drinking straw full of fluid. The fluid cannot go out until you take you finger off of the hole in the top of the straw. Same principle.
You have to get that small bleed hole open.
That is WHY you see so many posts on this forum about problems bleeding the brakes.
It is not the bleeding that is the problem .
On a Roadstar Adventure.
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