Master cylinder cleanout


Technical information and Q&A applicable to all years and models of Goldwings
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Sunshinenomad
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Master cylinder cleanout

Post by Sunshinenomad »





My new to my ‘01 Valkyrie clutch master cylinder window was a bit brown but not bad. I decided to change fluid anyway. When I emptied out the cylinder it was coated on the bottom with brown mud. :o Looks like the PO only added fluid when needed and never went further. I disassembled the master and cleaned it all up. After about 1/2 hr of bleeding the system, I have clutch again. Luckily, none of the mud was in the line.
Now on to the front brakes.


bri720a
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Re: Master cylinder cleanout

Post by bri720a »

I had the same issue from the PO on my VTX. I also got a lot of sludge in the calipers and especially the clutch slave cylinder. Used an entire large bottle of brake fluid flushing them.
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Rednaxs60
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Re: Master cylinder cleanout

Post by Rednaxs60 »

There's a clutch slave cylinder you might want to clean as well. Lots of crud can build up in the clutch slave.
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Engel6264
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Re: Master cylinder cleanout

Post by Engel6264 »



I just read what you found at the bottom of the reservoir and wondered if the fluid looked like this? How did you remove the fluid?
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kwthom
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Re: Master cylinder cleanout

Post by kwthom »

Engel6264 wrote: Mon Apr 26, 2021 6:42 am 178172278_10158836015805041_6052535713631195546_n.jpg

I just read what you found at the bottom of the reservoir and wondered if the fluid looked like this? How did you remove the fluid?
Turkey baster.
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WingAdmin
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Re: Master cylinder cleanout

Post by WingAdmin »

I usually just take a shop towel (you know, the blue, lint-free paper towels) and soak it up a bit at a time. Once most of it is gone, I'll spray brake cleaner in there to clean and dilute what's left, and then soak that up as well.
bri720a
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Re: Master cylinder cleanout

Post by bri720a »

Quite some time ago I purchased a vacuum pump for bleeding brakes and I use that to get most of the old fluid out and then a rag or shop towel etc. For the $20 or so the vacuum pump has been invaluable for a variety of jobs.
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flash2002
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Re: Master cylinder cleanout

Post by flash2002 »

One of the valks I bought had the same problem. I didn't take a chance and took it apart from one end to the other. I cleaned all the parts and flush the hose, why take a chance.
Sunshinenomad
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Re: Master cylinder cleanout

Post by Sunshinenomad »

I cleaned out and rebuilt both the clutch and front brake master cylinders. The most difficult was the circlips which were pretty crusty. An overnight soak in penetrating fluid (atf and acetone) did the trick. A couple of flushes with new fluid and all is good for another 20 years.🤪
lgjhn
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Re: Master cylinder cleanout

Post by lgjhn »

The pic below is what I dug out of the clutch slave cylinder on a much-neglected ’97 1500.


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Sig45227
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Re: Master cylinder cleanout

Post by Sig45227 »

What works even better than a turkey baster is a large syringe from Fleet Farm or some type of animal or farm supply store. And using them for years for all sorts of stuff.
FM-USA
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Re: Master cylinder cleanout

Post by FM-USA »

Turkey Baster here also.
I 'heat soften' the nozzle, insert the back end of a drill bit and make the hole smaller via plier squeez'ns. The fluid doesn't run out as fast.
As I do yard/garage sales I find the smaller basters. They don't suck up as much but the smaller one's takes up less space in the tool bag. ;)
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DenverWinger
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Re: Master cylinder cleanout

Post by DenverWinger »

After fiddling around with turkey basters not working so well, it hit me like a ton of bricks. Use the My-T-Vac. Sucked it all out of the reservoir like a charm. :D


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