Bubbles during bleeding.


Information and questions on GL1800 Goldwings (2001-2017)
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bohdan
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Bubbles during bleeding.

Post by bohdan »



Gents. I am aloof. See attached photo. This valve is closed and bubbles coming from somewhere. Put grease , silicone and all and to no avail still bubbles. I put my finger over the end pumped my mitivac and held vacuum
The tube is new and tight fit. I cut a few pieces. Bad / cracked bleeder valve? Help…
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Rambozo
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Re: Bubbles during bleeding.

Post by Rambozo »

Vacuum bleeders can often pull in air from a few places, even from the master cyl seals if the vacuum is strong enough. First thing make sure the fluid return passages in the master are not plugged. One is real tiny and easy to clog with gunk. A single strand from a wire brush, a welding tip cleaner, guitar string, etc. can be a big help. Try not to get carried away with the vacuum. if fluid is coming out, that is good enough. If it is leaking air at the bleed screw, that really doesn't matter. Bleed it then check the pedal/lever. If it doesn't pump up, job done. Not an issue with manual or pressure bleeding.
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Andy Cote
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Re: Bubbles during bleeding.

Post by Andy Cote »

The GL1800 does have some difficult high points for bleeding. Are the bleeders original? I ask because there were some knock-off Speedbleeders being sold with the wrong seat angle and other issues. Where did you use grease and silicone?
2015 Goldwing, basic black

Previously: GL1200 standard, GL1200 Interstate, GL1500 Goldwing, GL1500 Valkyrie Standard, 2000 Valkyrie Interstate, many other Hondas
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bohdan
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Re: Bubbles during bleeding.

Post by bohdan »

Yes Andy. This is the first fluid change in bike and all original. Original bleed screws. I put some around the bleed screw with attempts to seal it better as the picture you see the bleed screw is closed and the screw is not holding vacuum when closed. I think I may try the old fashioned way. Open… close….
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Andy Cote
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Re: Bubbles during bleeding.

Post by Andy Cote »

Okay. Let us know how you make out.
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Previously: GL1200 standard, GL1200 Interstate, GL1500 Goldwing, GL1500 Valkyrie Standard, 2000 Valkyrie Interstate, many other Hondas
Lickity Split
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Re: Bubbles during bleeding.

Post by Lickity Split »

Rambozo wrote: Sun Jul 18, 2021 12:23 am Bleed it then check the pedal/lever. If it doesn't pump up, job done. Not an issue with manual or pressure bleeding.
Poor advice. If I bled any of my brakes, (motorcycle, car, etc) and the pedal or lever didn’t pump up afterwards, I would NOT consider the job done.
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Re: Bubbles during bleeding.

Post by GoldWingrGreg »

bohdan wrote: Sat Jul 17, 2021 6:36 pm Gents. I am aloof. See attached photo. This valve is closed and bubbles coming from somewhere. Put grease , silicone and all and to no avail still bubbles. I put my finger over the end pumped my mitivac and held vacuum
The tube is new and tight fit. I cut a few pieces. Bad / cracked bleeder valve? Help…
I would not use what you see as sure evidence of air being in your brake system. The most important part of bleeding brakes is to test the peddle/lever before, and not inducing air into the system when bleeding the brakes.

To test your peddle/lever, be on a center stand, and sit on the m/c as if you are operating it, the engine needs to be off. Then, one at a time, apply a peddle/lever and check for a consistency while reapplying it. Basically, once the pads are applied, you should feel firmness, and when the peddle/lever is reaaplied, it should not pump up. Then let it sit for 30 mins, remount, and test your peddle/levers again.


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