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Mushy right front brake
Can this problem be caused by a bad master cylinder, or should I suspect old brake lines?. I do not have air in the system. Looking into the reservoir, I can see the piston moving back and forth under the orfice but I see nothing black that would be the rubber seal, and don't know if I should. I don't want to rebuild the cylinder if it is okay. Would an old brake line show signs of balooning if that is the problem.
Thanks for any advice.
If I need lines I will just call Jim & Sue at Vencowings.
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#1 07-11-2010, 09:48 AM,
It could be old rubber brake lines but I would start with flushing to old brake fluid with new DOT 4 fluid and make sure you have all the air out, that is usually what causes mushy brakes. If the master cylinder needs rebuilding it is a fairly easy job.
Ride safe have fun and enjoy. Lane
1985 Aspencade
2002 Vulcan
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#2 07-11-2010, 11:23 AM,
Mine got mushy a few days back. Turned out it was just a touch low on fluid. It actually looked full until I removed the cap and saw that it was down slightly. Topped it off and no more problems. \:d/
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#3 07-12-2010, 01:30 PM,
I went through this a few months back. Very frustrating. I rebuilt the front master cylinder first = no help. I even used my air conditioning servicing vacuum pump to pull fluid still no help. No matter what I did the level would pull to the grip. I tried every trick I knew to bleed the line. Finally I put a Goodrich stainless steel line whick was mushy at first then finally got firm after some line tapping and bleeding. It's not as rock hard firm as our 83 suz 1100 but it's a good brake and will lock the front wheel on dry pavement. I think either the old line is still good and air got stuck in the metal cross over line or the rubber separated internally and is holding air. I hope this helps.
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#4 07-13-2010, 05:41 AM,
Sundance, The reservoir being low wouldn't cause mushy brakes unless it was low enough to let air into the little orfice at the bottom. Have to be almost empty to do that.
Thanks, Robert
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#5 07-13-2010, 03:46 PM,
Wilmas2cool, Not sure which crossover line you are talking about. I made a mistake in my first post on the topic. The left caliper was the one I meant. AS I understand it the left is actuated by the hand lever and is not connected to any other caliper.

Your other comment got my attention. A Goodwrench line? What is that and where did you get it?
Thanks, Robert
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#6 07-13-2010, 03:52 PM,
Remove the caliper and place a block between the pads. Then pull the brake handle and see if it is firm. If it is not firm then there is a problem in the hydraulic system. If it is firm then it is a mechanical problem. First off the handle pivot could have play and cause a loose feeling. Also if the rubber bushings for the caliper bolts in the forks and caliper holders are weak it can cause a spongy feel. Another thing that you can check is for a warped brake rotor or misaligned caliper. With the bike stopped apply the brake lever. Pump it until it is firm. Then release it and apply it again. If the feel is firm then move the bike a few wheel revolutions and reapply the brakes. If it is mushy again then the rotor is warped or the caliper is misalligned and the rotation of the tire is pushing the pistions back inside the caliper. Once they have been pushed it it will take more lever travel with little resistance to push them back out before the brakes stop the bike. This extra travel is your mushy feel.
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#7 07-13-2010, 05:30 PM,
The left front brake disc actuated by the hand brake lever was the one that was mushy on mine.
The crossover tube is the metal brake line in front of the lower triple clamp between the 2 rubber brake lines. The Goodrich SS brake line I got from Dennis Kirk. I think about $85.00 for the line and fittings. I haven't cut the old rubber lines to see if they are separated on the inside to cause my problem. I tried so many tricks that I got dizzy. I've never had so much trouble bleeding a brake system. But now they are pretty solid.
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#8 07-15-2010, 04:17 PM,
Sorry. Misspelled brand. It's spelled "Goodridge". Quality seems fine so far.
Reply
#9 07-16-2010, 04:10 AM,


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