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My breaks keep locking up...

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Troy Copley
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May 03, 2011; 7:49pm

My breaks keep locking up...

Troy Copley
7 posts
My breaks were not working for a bit so i bleed the system and got them to work pretty good, kinda touchy, but they were actually stopping the bike.  They have locked up on me twice since then.  Yesterday they just unlocked on their own but today i released to bleeder valve for a second to let some of the pressure out and they were fine for the 8 min trip back to the house.  Does anyone know what my problem is?  
TOOLS1
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May 04, 2011; 3:05am

Re: My breaks keep locking up...

TOOLS1
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10170 posts
Sounds like the master cylinder is plugged up, and releasing the pressure from the caliper.
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)
Troy Copley
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May 04, 2011; 4:46pm

Re: My breaks keep locking up...

Troy Copley
7 posts
I just need to release the pressure that is built up?  Is there anything i can do so that this won't happen again?
TOOLS1
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May 04, 2011; 11:49pm

Re: My breaks keep locking up...

TOOLS1
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10170 posts
You will probably need to clean/rebuild the master cylinder. It's not hard to do. You just need the kit, and the special snap ring pliers. I got mine from vintagecb750.com
there is another thread on here where I posted a link to a good video on youtube on rebuilding the master.
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)
Re-run
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May 05, 2011; 1:52am

Re: My breaks keep locking up...

Re-run
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3494 posts
A rebuild kit is a good idea but what usually happens is that there are 2 holes inside the master, the small one gets blocked up and pressure cant be released. Take a small wire and poke into the hole and that will remove the blockage but it is temporary till you can dis-assemble the master to clean it. You may or may not need a kit. Mine was pretty bad but I cheaped it and did not get a kit as I was broke, that was like 6 years ago and it still does not leak. So disassemble and clean and see what happens or if your piston in the master is really bad, get the kit.
The ride IS the adventure. The destination is just to get gas!
Troy Copley
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May 05, 2011; 5:31am

Re: My breaks keep locking up...

Troy Copley
7 posts
Front and rear rebuilds will be the same? Not the parts but the labor involved?
TOOLS1
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May 05, 2011; 6:25am

Re: My breaks keep locking up...

TOOLS1
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10170 posts
Depends on what model you have, and what type of breaks it has.
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)
Troy Copley
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May 06, 2011; 9:22pm

Re: My breaks keep locking up...

Troy Copley
7 posts
I should be able to figure out how to do it.  Thanks for your help.
Re-run
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May 07, 2011; 2:57am

Re: My breaks keep locking up...

Re-run
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3494 posts
Get the manual if you have not yet.
The ride IS the adventure. The destination is just to get gas!
Troy Copley
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May 08, 2011; 9:52pm

Re: My breaks keep locking up...

Troy Copley
7 posts
I have gotten one.  Im not to sure if it has how to rebuild the cylinder though...
TOOLS1
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May 09, 2011; 3:58am

Re: My breaks keep locking up...

TOOLS1
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10170 posts
Here is a link to a really good video. http://www.youtube.com/watch?v=2W24asyNujs (we need to put this link up in the manual section, or something, for future reference.)
Be sure to get the special snap ring pliers. I got mine from vintagecb750.com for $10.00. Well worth the price.
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)
Troy Copley
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May 09, 2011; 9:50pm

Re: My breaks keep locking up...

Troy Copley
7 posts
awesome thank you very much.  
Re-run
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May 10, 2011; 1:18am

Re: My breaks keep locking up...

Re-run
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3494 posts
I used a small flat head precision screw driver to get mine out. I'm cheap like that sometimes.
The ride IS the adventure. The destination is just to get gas!
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