Problem Bleeding Brakes - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 10 (permalink) Old 10-29-2016, 10:25 PM Thread Starter
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Problem Bleeding Brakes

I just finished assembling my newly rebuilt calipers and master cylinder onto my Vulcan, but the caliper pistons are just wiggling back and forth when pushing on the brake lever, not actually pushing outward fully. Any ideas? Probably a problem with the master cylinder. I vacuum bled the brakes several times just to be sure.

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post #2 of 10 (permalink) Old 10-30-2016, 02:13 AM
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take off master cylinder cap.pull brake lever in and tie to handlebar. let it sit overnight

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post #3 of 10 (permalink) Old 11-11-2016, 02:22 PM Thread Starter
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So the calipers were leaking, and after cleaning the $hit out of them and re-installing with new stainless lines the brakes still won't [email protected]#$ing bleed!! I'm ready to set this bike on fire.

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post #4 of 10 (permalink) Old 11-11-2016, 02:30 PM
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Do you get any resistance at all from your brake lever, or does it resist but without actuating the pads?
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post #5 of 10 (permalink) Old 11-11-2016, 02:39 PM Thread Starter
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If I pump it up quickly I get about 20-30% of normal resistance. I don't know if this should happen or not because I've never had these working before, but the caliper body visibly moves when applying pressure (when there is any).

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post #6 of 10 (permalink) Old 11-11-2016, 09:17 PM
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Sounds like you've got air trapped somewhere away from the bleeder valves (air bubble in the brake line near the master cylinder, or something similar)
Hate to have to link to an external source, but there's some interesting comments here:
Help! I can't get brake pressure after replacing brake lines on Strom | Adventure Rider

1992 US-nonCA * tuxedo mod * r/r relocated

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Service Manual Download
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post #7 of 10 (permalink) Old 11-13-2016, 03:57 PM
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Just had the same problem myself, Ive had the bike completely stripped to the frame, and all back together, the calipers were stripped, painted and rebuilt. I tend to fill the reservoir and use a syringe and clear pipe on the nipples and draw the fluid from the reservoir through the nipples, usually works fine every time, but on this ocaision I couldn't seem to get a good lever. I pumped up the leaver and tied it back overnight, hoping all the air would return to the reservoir, but next day there was nothing on the lever, and on further inspection, both banjo bolts at the calipers and one at the splitter were found to be weeping slightly withe the pressure on overnight, I had reused all the old copper washers, and darn tighten the banjos any more for fear of stripping,so lesson learnt, fit new copper washers or of course I could just anneal the old ones an reuse them! So check all your fittings!
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post #8 of 10 (permalink) Old 11-14-2016, 10:36 AM Thread Starter
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I replaced all the banjo fittings and washers. I'm going to try to find a place around town with a large syringe so I can reverse bleed them. *Fingers crossed*

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post #9 of 10 (permalink) Old 11-14-2016, 01:39 PM
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you wouldn't like the way I do it. brake fluid tastes awful.

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1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
I am a BIKER and i'm proud.FREEBIRDS MC CENTRAL NY

lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
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post #10 of 10 (permalink) Old 11-16-2016, 07:19 PM
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Done brakes on numerous vehicles. Vulcan gave me fits. Someone suggested tying the brake lever and leaving it overnight. Worked for me where pumping a quart thru with a vacuum buddy failed.
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