Brake prblems.


Information and questions on GL1200 Goldwings (1984-1987)
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rolandck
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Brake prblems.

Postby rolandck » Fri Mar 20, 2009 1:21 pm



[code][/code]I own a GL1200 Goldwing 1985. I have new rotors, pads all the way around. i have rebuilt the rear master cylinder. I am unable to get good strong braking to the rear even though it bleeds well. I have taken it to 2 shops where they haven't been able to figure it out. Any one have this problem or any advice? Thanks My e-mail is rolandck@umich.edu I am not to good with computers so I hope I can find this again



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WingAdmin
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Re: Brake prblems.

Postby WingAdmin » Sun Mar 22, 2009 7:57 pm

How are you bleeding the brake?

rolandck
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Re: Brake prblems.

Postby rolandck » Mon Mar 23, 2009 10:34 am

I recieved word yesterday that my brakes are fixed. I haven't been told what was wrong but I think it was in the linkage. I will post a reply when i know. Thanks. Roland

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detdrbuzzard
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Re: Brake prblems.

Postby detdrbuzzard » Mon Mar 23, 2009 7:26 pm

rust had probally built up on the pins preventing the pads from floating like they should or at least thats what was wrong with mine. the guy that replaced my rear tire showed me and fixed it for me while he had the rear wheel off
'99 ST1100, '93 se
'75 cb750k, '79 cb 750f, '79 cb750 superK
cb 450sc, sunL70
'06 st1300a
.... william

rolandck
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Re: Brake prblems.

Postby rolandck » Tue Mar 24, 2009 9:23 am

I talked to the shop yesterday and they apparently don't have it fixed like they said they did, but they think it is in the proportioning valve. Brakes were power bled and manually bled. Pads, pins, rotors are new, there is no air in the lines and fluid comes out strong when bleeding. Pistons were cleaned and new seals installed. They blocked off the front right brake line and tried the back again and then adjusted the proportioning valve with no differance. It's been a real mystery.
Roland

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WingAdmin
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Re: Brake prblems.

Postby WingAdmin » Tue Mar 24, 2009 10:47 am

It sounds like they have more or less eliminated the hydraulic portion of the system as the problem. The only things I can think of remaining as a potential problem are:

  • As detdrbuzzard mentioned, corroded or dry sliders on the rear caliper, so only one pad is applied to the rotor. Pressing the brake bends the caliper to one side, but does not properly engage the brakes. Releasing the brake causes the caliper to bend back to normal - which will push the fluid back to the master cylinder, meaning pumping the brakes won't build it up.
  • A hung up brake pad. If a pad retaining pin is corroded, and a pad is stuck on it, when the brakes are deployed, one side of the pad will be pressed onto the rotor as one piston is extended, until you run out of pressure from the pedal stroke. Releasing the pedal will cause the pad to push the piston back in, because it is being bent - which will push the fluid back to the master cylinder, meaning pumping the brakes won't build it up.
  • A mistake in the master cylinder rebuild, or a defective rebuild kit, causing fluid to leak past one of the seals.
  • Misadjusted rear brake lever, so the pedal stroke is not fully pushing the piston in for its full travel
  • Old rubber brake lines that are swelling during the pedal stroke, not allowing full pressure to the caliper

rolandck
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Location: United States

Re: Brake prblems.

Postby rolandck » Tue Mar 24, 2009 1:07 pm

Thanks for the tips. I will look closer to see if the caliper is twisting or being bent. It is an old bike at 24 years old and I might not have noticed the lines bulging. I will let you know what I find. Thanks for the help.
Roland

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detdrbuzzard
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'79 750f.'85450sc
'06 st1300a

Re: Brake prblems.

Postby detdrbuzzard » Sun Mar 29, 2009 10:21 am

also when doing the rear brakes remember it is linked to the front and any air trapped in the linked front line will affect the rear
'99 ST1100, '93 se
'75 cb750k, '79 cb 750f, '79 cb750 superK
cb 450sc, sunL70
'06 st1300a
.... william

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WingAdmin
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Re: Brake prblems.

Postby WingAdmin » Mon Mar 30, 2009 8:58 am

Did you find out what was wrong with your brakes?

rolandck
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Re: Brake prblems.

Postby rolandck » Mon Mar 30, 2009 11:43 am

Yes, I was able to fix my brakes thanks to your tips. I picked up the bike from the shop Saturday since they had quit working on it. I took it home and took the rear caliper off as it was bending when i pressed the pedal. The pins were in hard even though they were replced. I put some lubricant on them and reinstalled the pads. The brakes were good but not great. I was able to adjust the linkage by almost a 1/4 inch and then I had great brakes. I can't figure out why a professional shop can't figure these things out. Thanks for the help! This is a great site. Sincerly, Roland

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

Re: Brake prblems.

Postby WingAdmin » Mon Mar 30, 2009 11:52 am

Great!! Glad we could help!

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fatfenders
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Motorcycle: 1984 GL1200 Aspy

Re: Brake prblems.

Postby fatfenders » Wed May 06, 2009 12:11 pm

Old thred I know but it is ashame that these so called pros cant't get it right , they don't seem to care get it in and out and collect as much dollars as they possibly can, that why we need to attempt to do all our own repair on our rides, that's just my two cents, Glad you figured it out!! :D :roll:
rolandck wrote:Yes, I was able to fix my brakes thanks to your tips. I picked up the bike from the shop Saturday since they had quit working on it. I took it home and took the rear caliper off as it was bending when i pressed the pedal. The pins were in hard even though they were replced. I put some lubricant on them and reinstalled the pads. The brakes were good but not great. I was able to adjust the linkage by almost a 1/4 inch and then I had great brakes. I can't figure out why a professional shop can't figure these things out. Thanks for the help! This is a great site. Sincerly, Roland




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