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Finally got the new to me 85 carbs done and rode it today. I had no rear/foot brake. But good hand brake. Took it home and bled the foot brake with a helper doing the pumping. Foot brake pedal feels great now. But haven't rode it. But I'm sure its fine.

So I thought might as well do the hand brake too. Bled it several times, then suddenly lost all pressure and can't get it back. I think my helper might have been squeezing too hard and possibly blew a seal in the master cylinder. Does that sound logical?

If I take the line off the master and hold my finger over the hole and squeeze, it will suck my finger in, then I have a firmer lever again. I hook the line up and no pressure.

I'm trying a gravity bleed now but not expecting much. Any ideas? Thanks.
 

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The return hole in the master cylinder is plugged up. There is a little metal cap in the bottom, pull it out and under it is a tiny little hole.
 

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The return hole in the master cylinder is plugged up. There is a little metal cap in the bottom, pull it out and under it is a tiny little hole.

Did that all ready too,,,lol.
 

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I think there are two holes under that cover. The small one is nearly invisible.
 

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Small hole plugged or you let the master go dry when bleeding, not uncommon to have to bleed the master especially after rebuild.
Cover everything up and disconnect the hose but keep it close.
Wearing gloves use your finger like a bleeder over the master outlet e.g. pull and hold leaver, release and replace finger, release lever repeat till master pressure forces finger off then with lever in reconnect hose and bleed to caliper keeping master full all the time.
Never heard of anybody overpressuring a Honda master and doubt its possible but it is possible over travel has hit some corrosion in the bore in which case a strip and seal kit is in order
 

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Discussion Starter #9
The right hand side master cylinder is the front hand brake. Left side is the clutch. (As you sit on bike.)

When I say left side I'm talking about the brake caliper.
 

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I used a Mityvac vacuum bleeder and all is well now. Thanks for the help.
 

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I used a Mityvac vacuum bleeder and all is well now. Thanks for the help.
Hopefully you pulled whatever was plugging that return hole through. Better take a bleeder wrench with you so you can release the pressure when the brakes heat up though just in case.
 

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Discussion Starter #13
Hopefully you pulled whatever was plugging that return hole through. Better take a bleeder wrench with you so you can release the pressure when the brakes heat up though just in case.

This wasn't broke until I fixed it,,,lol. It was working just fine until I decided to bleed it. It was nasty in there so I cleaned it. I used a tooth pick to try and gently clean the hole. But I was scared there might be a seal underneath. I also used a q-tip. That's probably what put the junk in the hole causing the problem that did not exist before.

Do you think a tooth pick is even small enough to get in there? Is there a seal under that hole that I have to watch for? Thanks.
 

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nope, a very fine wire from a bristle brush is what is usually used.
 

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You didn't get the small hole. There are two under that cover.
Take Dave's advice and carry some tools.
 

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Discussion Starter #16 (Edited)
You didn't get the small hole. There are two under that cover.
Take Dave's advice and carry some tools.

I'll be taking it back apart to do it correctly.

Speaking of correctly. My metal tab thingy was standing straight up in the hole. I put it in like I thought it went. But I might have it upside down. I just watched a youtube video and this guy has his opposite of mine.

Is this the the right way? Seems like it would totally block the hole this way. This is a screenshot from youtube.

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That is correct. The tiny hole in question is under the end closest to the banjo bolt. It takes a fine wire like from a wire brush or maybe a small sewing needle.
 
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