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Front Master Cylinder issue

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Old Jun 6, 2014 | 11:14 PM
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Default Front Master Cylinder issue
Rebuilding an 89 sportster... Soaked up all the fluid that was left in the front master and added dot 4 in there. I then hooked up my vac to the bleeder screw and sucked everything through. Everything seemed fine after pumping on the brakes a few times, then the lever stopped springing back. I could put a flat blade screwdriver in there and draw it back, but the next time i pushed on it, it gets stuck at the end again.

I just read about the whole don't mix dot 4 with 5 issue...

I was thinking that the spring inside the master snapped, but now after reading about the mixing of 4 and 5, I think I have way worse problems...

Can anyone tell me what I'm going to have to do to fix this now?

Thanks.
 
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Old Jun 7, 2014 | 06:32 PM
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83 views and not a single reply?

Anyone... Anyone... Anyone......
 
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Old Jun 7, 2014 | 06:42 PM
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pull the MC and the Caliper apart and clean with alcohol/brake clean, reassemble then start again.
 
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Old Jun 7, 2014 | 10:57 PM
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How do you get the insides out of the master cylinder? Is there a snap ring or something in front of or behind the dust boot?
 
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Old Jun 11, 2014 | 06:00 PM
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Can anyone tell me how to disassemble the front master cylinder?
 
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Old Jun 11, 2014 | 07:21 PM
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Originally Posted by ZEW
Can anyone tell me how to disassemble the front master cylinder?
Have you done either a YouTube or Google search?
 
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Old Jun 11, 2014 | 07:24 PM
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I'd suggest you buy a shop manual if you going to try to do your own work. Why did you mix dot 4 with dot 5 ?
 
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Old Jun 11, 2014 | 09:22 PM
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I have the manual... It doesn't show how to disassemble it. There is nothing on youtube, I checked already, hence why I am here asking.

I was in a rush and made the mistake of not looking up what fluid it used. I assumed dot4 because everything else i have uses 4.
 
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