hears one for you guys... - Suzuki GSX-R Motorcycle Forums Gixxer.com

 
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post #1 of 5 (permalink) Old 07-09-2011, 10:46 PM Thread Starter
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hears one for you guys...

Hears one for you guys !!
I finally got the wifes 86 750 gremlins worked out of the carbs and ignition.
So we decide to ride today and go to her sisters @ 40 miles away. as we are driving on a rural road @ 40-45 mph , she is aprox. 75-100 feet in front of me and I see i huff of black smoke come from the bike, me thinking she down shifted and was going to run it threw the rrr's. I thought it was a fuel huff of smoke. But no sooner i think this she is pulling off the road, me now thinking its the carbs again, i pull up next to her and ask whats up, she goes the front breaks locked up, I said What ??
Well some how while driving the master cyl got pressurized and locked the breaks up on the bike. so i think for a while and get the handy adjustable wrench out and break the banjo bolt at the master cyl and the pressure releases.
Now the bike has no front breaks at all.

I never heard of a master cyl pressurizing its self with out touching it.

Any one ever hear of this ????
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post #2 of 5 (permalink) Old 07-09-2011, 11:04 PM
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Re: hears one for you guys...

here you go

http://www.zxforums.com/forums/zx-6r...ng-brakes.html

His was aftermarket lever not allowing the plunger to fully return, making it a one way system (or extremely slow return), same might happen if the return spring was weak or broken or the bore for the plunger was somehow damaged/blocked. Sounds like shes a good rider to not bin it, that'd give me the shits
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post #3 of 5 (permalink) Old 07-09-2011, 11:45 PM Thread Starter
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Re: hears one for you guys...

Quote:
Originally Posted by FruitLooPs View Post
here you go

http://www.zxforums.com/forums/zx-6r...ng-brakes.html

His was aftermarket lever not allowing the plunger to fully return, making it a one way system (or extremely slow return), same might happen if the return spring was weak or broken or the bore for the plunger was somehow damaged/blocked. Sounds like shes a good rider to not bin it, that'd give me the shits
WOW !!!

This makes so much sense now.
The bike has an 89 master cyl and the lever was broken so we put a lever on from an 05 gs500 that was in our shed. it fit so we used it but like explained in the thread you put up, the lever was pushing the plunger in a hair, I didnt think it was an issue cause it didnt activate the break light and the bike still moved freely.

BUT how did this happen while driving on an open road and haven't hit the breaks in @ 3/4 - 1 mile ???
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post #4 of 5 (permalink) Old 07-10-2011, 07:00 AM
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Re: hears one for you guys...

pads rubbing against discs-heat generates, that causes brake fluid to expand (maybe old brake fluid with some moisture in it), that generates pressure in the system.
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post #5 of 5 (permalink) Old 07-10-2011, 04:20 PM
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Re: hears one for you guys...

too much fluid will do that also...
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