Front brake operation question - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 15 (permalink) Old 07-06-2009, 08:05 AM Thread Starter
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Front brake operation question

Do you guys know (or gals) what in the brake system is supposed to or does, cause them to release after you let go of the lever?

Is it the fluid returning to a "relaxed" state, or a spring in the MC?

I ask because mine is starting to intermittently not release when I let go of the lever; I have to push the lever forward so the bike will roll. Used to be they would stick when used the first time coming out of the garage after a few days of no use, but yesterday they stuck twice after, and while I was out riding for a while.

I changed the brake fluid twice last year, now its less than a year old, and I used synthetic at the time. It doesn't look new anymore, but it doesn't look all that bad just yet either. I'm going to flush and change it this week anyway just to rule it.

Seems like an odd problem, and made me start wondering what it is that is supposed to make them release...

TIA.
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post #2 of 15 (permalink) Old 07-06-2009, 08:16 AM
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doug , there is a spring on the piston in the mastercylinder on the piston, yours might be weak or it might be dirty , you might need a rebuild.

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post #3 of 15 (permalink) Old 07-06-2009, 08:59 AM
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On my maxim I had problem with the calipers. I removed them and cleaned them up. Fixed the problem.

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post #4 of 15 (permalink) Old 07-06-2009, 11:12 AM
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What color is your fluid, my piston at the wheel was sticking and i had fluid with water in it. I took the master cylinder apart, and cleaned everything, then bleed the system.

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post #5 of 15 (permalink) Old 07-06-2009, 11:20 AM
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IIRC there is a very small passage in the MC that allows some of the fluid to return. That passage may be partly blocked. A MC rebuild or at least thorough cleaning may be needed here.

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post #6 of 15 (permalink) Old 07-06-2009, 04:47 PM
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for sure, i had this "jelly" like substance in mine, and it plugged up my small hole in the master cyclinder. My handle was very firm, i flushed it out, and blead it, now its perfect

1986 Vn750
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Bone Stock
New cam chain tentioners
all fluids changed
Spline Lube
windshield
Engine Guard
B-stone S11 RWL-stock sizes
*wanted*
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2001 Vn750
13,100 miles, and counting
spline lube
Bridgestone S11 100/90
Shinko 170/80
rear end oil change
aftermarket mirrors
windshield
otherwise all stock
*anticipated mods*
Engine Guard
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post #7 of 15 (permalink) Old 07-06-2009, 06:33 PM
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Be a great time to flush out all the old fluid and start fresh from an unopened can.

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post #8 of 15 (permalink) Old 07-06-2009, 08:24 PM
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I have the T-shirt so to speak, rebuild the M/C and make certain that you use compressed air on the MC Chambers to clean out the return hole. That will cause you to lock up if it's not open.

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post #9 of 15 (permalink) Old 07-06-2009, 08:45 PM Thread Starter
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Thanks for taking the time guys. I'll start going thru it then and see what's what. I'm thinking since it's so intermittent that it's probably dirt or grime somewhere in there. I don't know why but I was thinking the MC was rebuildable/fixable. Probably the long holiday weekend and trying to get ready for work or something...anyway, thanks for the replies, and I'll get back with the findings.
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post #10 of 15 (permalink) Old 07-06-2009, 08:59 PM
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The MC is rebuildable, you can buy a kit on ebay for about $29.00. I've rebuilt 2 of them so far. In the MC there is a larger hole and right next to an extremely tiny hole smaller than a pin head; that hole MUST be open and clean or you will lock up! Use compressed air to clean out the chambers, you'll feel air coming out of it when you do so you'll know it's clean. Good time to flush out your system and replace the fluid. Buy yourself a set of speedbleeders if you don't have them, it makes bleeding the brakes a breeze.

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