Brake fluid question


Technical information and Q&A applicable to all years and models of Goldwings
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drtimm@att.net
Posts: 33
Joined: Tue May 01, 2012 9:46 pm
Location: Lincoln, California
Motorcycle: Honda Goldwing, 2002 GL1800

Brake fluid question

Postby drtimm@att.net » Wed Feb 20, 2013 10:48 pm



What is the reason for a paste like substance to have collected in behind my brake caliper pistons? I assume it is a breakdown in the brake fluid, but I'm not sure. Thought some of you seasoned mechanic could educate me on this so I could better understand what I'm seeing and know the cause. I will be changing out the old brake fluid. Thanks.

Dennis Timm
Lincoln CA



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themainviking
Posts: 2579
Joined: Wed Sep 29, 2010 6:59 pm
Location: North Bay, Ontario, Canada
Motorcycle: 2009 GL1800 AD

Re: Brake fluid question

Postby themainviking » Thu Feb 21, 2013 7:09 am

Do you mean inside the calipers, in the hole that the piston fits into? If any paste like substance is in there, it must be from moisture that has gotten into your brake fluid over time. I have never seen anything inside a caliper, but I have seen this sort of thing inside the brake cylinder, so it must be possible for it form in the calipers also. I would just clean it all out real well, and definitely replace the brake fluid.
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drtimm@att.net
Posts: 33
Joined: Tue May 01, 2012 9:46 pm
Location: Lincoln, California
Motorcycle: Honda Goldwing, 2002 GL1800

Re: Brake fluid question

Postby drtimm@att.net » Thu Feb 21, 2013 7:52 pm

Yes, the paste like substance was in the piston cylinder. I'm changing the brake fluid after rebuilding the calipers. I've hit a snaffo, can't get brake fluid to move thr. the system in order to bleed the line. This is after having the pistons out in the front left brake, putting everything back and filling the master reservoir and placing the cap and diaphragm. Get no resistance on the lever. Any thoughts?

jdvorchak
Posts: 39
Joined: Thu Jul 16, 2009 11:58 pm
Location: East Alton, IL
Motorcycle: 2001 GL1800
2000 HD Dyna FXDX
1984 GL1200 STD

Re: Brake fluid question

Postby jdvorchak » Sun Feb 24, 2013 7:11 pm

You need to keep pumping the lever. Pump, pump, hold. Then open the bleeder at the caliper while holding the lever all the way to the grip. Only when you have the bleeder screw tight again release the lever. Repeat as necessary. Slow smooth strokes work best. It's not a race to see how fast you can pump the lever.

You might just want to make sure to bleed the MC first. Pump, pump, hold. While holding open the banjo nut and see if air or fluid comes out. Do that until just fluid comes out then move the to brake caliper bleed screw. This part is messy and fluid will squirt all over the place. I usually cover my entire bike with blankets or better yet a plastic drop cloth.

You just haven't pumped it enough. If you expect pressure, you won't get any until you have fluid filling the lines and the calipers.

If you have or can borrow a vacuum bleeder that will hurry things up a lot!

drtimm@att.net
Posts: 33
Joined: Tue May 01, 2012 9:46 pm
Location: Lincoln, California
Motorcycle: Honda Goldwing, 2002 GL1800

Re: Brake fluid question

Postby drtimm@att.net » Wed Feb 27, 2013 10:26 am

Thanks for the tips, didn't know you may have to bleed the MC as well. However, I have the problem solved. A riding buddy had a vacuum pump and we resolved the problem.

Again thanks for taking the time to respond.




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