Brakes not totally grabbing


Information and questions on GL1100 Goldwings (1980-1983)
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robertdawber
Posts: 285
Joined: Fri Aug 07, 2009 9:24 pm
Location: Eliot, ME
Motorcycle: 1983 GL1100 Interstate

Brakes not totally grabbing

Postby robertdawber » Sun May 24, 2015 8:35 pm



Hi-
Almost done with a huge project. I went for a 5-mile ride and the brakes seem off. I had rebuilt the rear master cylinder, cleaned the front including the return port, and rebuilt all three calipers. (I have rebuilt these before)
I put in speed bleeders in all three as well. I used my Mighty Vac to bleed the brakes and had no air. I did the right front first, the rear and then the left front.
The brakes used to grab far quicker and I would stop much better than today.
Any advice or ideas would be wonderful!
Bob :D



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Aussie81Interstate
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Location: Penrith Australia
Motorcycle: 1982 CX500 Turbo (restoration project)
1981 GL1100 Interstate (sold)
1988 GL1500

Re: Brakes not totally grabbing

Postby Aussie81Interstate » Sun May 24, 2015 10:38 pm

Bob,

If you put new brake pads in - they will not bed in (surface match with your rotors) for quite a few applications - but will get better.
When you get a clear bit of road ahead and behind - then puill on the brakes progressively harder - you could scuff up the pads initially and that will help as well. I found mine were awful for the first hundred or so applications - so I took them out and used a rough file across them - and it worked wonders. Work pretty well now - but will be going for braided lines soon - that will sort them out.

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WingAdmin
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1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
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2007 Aspen Sentry Trailer

Re: Brakes not totally grabbing

Postby WingAdmin » Tue May 26, 2015 11:59 am

It's also possible that you did not get all of the air out of the system when bleeding it.

robertdawber
Posts: 285
Joined: Fri Aug 07, 2009 9:24 pm
Location: Eliot, ME
Motorcycle: 1983 GL1100 Interstate

Re: Brakes not totally grabbing

Postby robertdawber » Tue May 26, 2015 6:48 pm

WingAdmin wrote:It's also possible that you did not get all of the air out of the system when bleeding it.

Scott, help me out with this. I had a very clear line (no bubbles). The line is about 2 feet or so. I kept going for about 1 minute after the clear line, while refilling the reservoir (s) I read someting about air bubbles at the banjo bolt-but all threee?

How long would you think bleeding is required after you see clear?
What more could I do?

Thanks
Bob

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WingAdmin
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1982 GL1100A Aspencade (sold)
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2007 Aspen Sentry Trailer

Re: Brakes not totally grabbing

Postby WingAdmin » Wed May 27, 2015 9:39 am

Are the brakes just spongy overall? If you pump the brake lever a couple times, does it firm up and become much stronger? Or is it that you just don't have the braking power - they are firm, but it's not stopping as well as it did before?

robertdawber
Posts: 285
Joined: Fri Aug 07, 2009 9:24 pm
Location: Eliot, ME
Motorcycle: 1983 GL1100 Interstate

Re: Brakes not totally grabbing

Postby robertdawber » Wed May 27, 2015 10:39 am

WingAdmin wrote:Are the brakes just spongy overall? If you pump the brake lever a couple times, does it firm up and become much stronger? Or is it that you just don't have the braking power - they are firm, but it's not stopping as well as it did before?

They do not feel as firm as they did prior to this. The pedal and lever travel further.

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WingAdmin
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Posts: 17050
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Brakes not totally grabbing

Postby WingAdmin » Wed May 27, 2015 1:11 pm

That's usually an indication of air in the system, but it could also be non-bedded in pads.

robertdawber
Posts: 285
Joined: Fri Aug 07, 2009 9:24 pm
Location: Eliot, ME
Motorcycle: 1983 GL1100 Interstate

Re: Brakes not totally grabbing

Postby robertdawber » Thu Jun 04, 2015 10:16 pm

WingAdmin wrote:That's usually an indication of air in the system, but it could also be non-bedded in pads.

I found the issue.
When I cleaned the return port on the front master cylinder I had to pull the reservoir off. That o-ring needed to be replaced. There was a small leak that I did not see until I got back to working on it today. New o-ring and all set.
Also, the crush washers might have been too tight. I did not use a torque wrench the first time.
Thanks for all of the help!




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