front brake locked up. released it. now what? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 15 (permalink) Old 05-11-2015, 01:09 PM Thread Starter
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front brake locked up. released it. now what?

Hi guys. Thanks for reading. I was riding in my subdivision the other day and my front brake locked up for whatever reason. I wasn't even using the brake. The handle was let all the way out and I could not squeeze it in. I used a wrench to release the bolt on the right side caliper, squirted some fluid out, and it worked fine other than being a little mushy. Comments? Suggestions? I assume I can open what I believe is the master cylinder on the handle bar and inspect but other than that, I'm lost. Maybe I need to flush all the fluid out and replace? I did a search and found similar issues but wasn't clear on the outcome. Thanks in advance.
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post #2 of 15 (permalink) Old 05-11-2015, 01:26 PM
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fluid gets old and turns into jelly clogging up the little passage ways

out with the old in with the new might be enough to fix it but to be sure i would disassemble the whole front brake system and give it a real good cleaning because if that front brake locks up at highway speeds your gonna be one sore mutha flucka if not worse

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post #3 of 15 (permalink) Old 05-11-2015, 01:32 PM
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also check the hoses they get old and collapse
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post #4 of 15 (permalink) Old 05-11-2015, 01:42 PM
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also check the hoses they get old and collapse
the can collapse, and if they do, you wont see it from outside. the inner lining collapses.

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post #5 of 15 (permalink) Old 05-11-2015, 01:45 PM
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I'd rather be safe than sorry and just flush the whole system. You could take the plunger out and make sure everything looks good before putting new juice in.

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post #6 of 15 (permalink) Old 05-11-2015, 01:56 PM Thread Starter
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OK thanks guys. I forgot to mention its a 1995 that has been mostly sitting the past three years.
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post #7 of 15 (permalink) Old 05-11-2015, 06:16 PM
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OK thanks guys. I forgot to mention its a 1995 that has been mostly sitting the past three years.
Yikes. make sure you bleed them once you are done. I rebuilt my calipers, master brake cylinder and replace the brake lines. All is good.

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post #8 of 15 (permalink) Old 05-14-2015, 02:55 PM Thread Starter
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Hey guys sorry but I have to bump this back up. After the initial lock and release, I changed the brake fluid and cleaned the master cylinder. The fluid was brown and there was some gunk in there. Got is all cleaned up, refilled, bled, and good to go. Rode is a few miles with no problems. Stopped at a sign, made a turn and then accelerated through the gears. Got into fifth and it stopped acccelerating even at full throttle at around 50 mph. I let off the throttle and the bike began slowing me down hard. I pulled off to the side of the road. I could not even pull the brake lever. It was locked all the way in the full release position. The only way I could get it to release was to turn the nut near the bleed valve and let some fluid drain out. Then it worked fine. I drove it back home and parked it without any problems. It seems maybe the caliper is not releasing all the way and then it heats up and expands the fluid and it wont release?

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post #9 of 15 (permalink) Old 05-14-2015, 03:37 PM
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with gunk in the fluid, it points towards the calipers probably needing to be rebuilt. if not them, either lines have collapsed, or still pluggingh in master cylinder

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post #10 of 15 (permalink) Old 05-14-2015, 03:57 PM Thread Starter
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OK thanks. I had to hurry to work but when I get home I'll probably swap some more fluid. If that doesn't do it I will have to look into what it takes to rebuild...

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Purchased 5/3/2015 w 10,600 miles
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