Vintage and Classic Hondas

brake caliper leaking

classic Classic list List threaded Threaded
♦
♦
 11 messages Options
JonnyLow
Reply | Threaded
Open this post in threaded view
♦
♦
|

brake caliper leaking

JonnyLow
Just rebuilt the front brake caliper. This consisted of me taking it apart and soaking it in carb cleaner, then putting a new seal in. Now, it leaks terribly. I've separated the two halves of the caliper, removed the brake pad and pumped the brake lever and I can see a bunch of air bubbles and fluid coming out from around the piston. Obviously it isn't sealed very well. It's a brand new seal. Anyone have any idea whats going on? Thanks.
JonnyLow
Reply | Threaded
Open this post in threaded view
♦
♦
|

Re: brake caliper leaking

JonnyLow
Would coating the piston in grease help?
Piute
Reply | Threaded
Open this post in threaded view
♦
♦
|

Re: brake caliper leaking

Piute
In reply to this post by JonnyLow
You may need the piston also
My F2 (dual Disc)was missing one of the calipers picked up a used one pretty rusty looking ,So automatically ordered a complete kit with piston.Come to find out I needed it for the good looking one I already had and the rusty one was just fine ,So Piston maybe

 I did spray a Lil silicone on it when I put it on
                            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,
                                       
 
shinyribs
Reply | Threaded
Open this post in threaded view
♦
♦
|

Re: brake caliper leaking

shinyribs
Administrator
Just a thought.Is it possible to put the seal in backwards?If not I would suspect either a faulty seal or a pitted/scratched piston.
JonnyLow
Reply | Threaded
Open this post in threaded view
♦
♦
|

Re: brake caliper leaking

JonnyLow
No, the seal is basically an o-ring, no way for it to be backwards...
TOOLS1
Reply | Threaded
Open this post in threaded view
♦
♦
|

Re: brake caliper leaking

TOOLS1
Administrator
What model is the bike?
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)
Piute
Reply | Threaded
Open this post in threaded view
♦
♦
|

Re: brake caliper leaking

Piute
Hey JohnyLow you refering to your "76"K
                            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,
                                       
 
lcochran
Reply | Threaded
Open this post in threaded view
♦
♦
|

Re: brake caliper leaking

lcochran
I've got this air bubble issue too.  And the handlebar lever isnt pumping up to pressure. 75 cb750f btw
JonnyLow
Reply | Threaded
Open this post in threaded view
♦
♦
|

Re: brake caliper leaking

JonnyLow
Mine is a 1976 cb750k. Upon further inspection, I think there might be a little chunk missing from the rubber seal. I am going to order another one and see if that fixes the problem... I can't think of any other reason brake fluid would just stream out of the caliper like it is.
JonnyLow
Reply | Threaded
Open this post in threaded view
♦
♦
|

Re: brake caliper leaking

JonnyLow
Update: When I got the new seal, I compared it to the old one and sure enough there was some rubber missing. Replaced the seal and now the brake is working great.
Piute
Reply | Threaded
Open this post in threaded view
♦
♦
|

Re: brake caliper leaking

Piute
                 
                           1st post made a LIL confusing ?Don't mean to steer ya wrong.
   
   Just rebuilt the front brake caliper. This consisted of me taking it apart and soaking it in carb cleaner,                                    then putting a new seal in.                  Now, it leaks terribly. I've separated the two halves of the caliper, removed the brake pad and pumped the brake lever and I can see a bunch of air bubbles and fluid coming out from around the piston. Obviously it isn't sealed very well.                      It's a brand new seal.                                                                   Anyone have any idea whats going on? Thanks.


                                                                      YA-NO
                            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,
                                       
 
Free forum by Nabble Edit this page