Brake problem - TwoWheelForum: Motorcycle and Sportbike forums
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post #1 of 4 (permalink) Old 08-17-2005, 09:27 AM Thread Starter
ShanMan14's Avatar
Join Date: Jun 2004
Location: FREE THE HOPS!
Posts: 10,104
Brake problem

This morning, I got the bike out to ride to work and I noticed the brake lever travel was abnormally long.

The travel in the lever has been getting more and more, and I've been dialing the adjustment slowly down to "1", the lowest setting to reduce the travel. This morning it was almost touching the grip, not good.

The reservoir was full of transparent fluid, nothing obvious (leaks). I removed the cap to find the membrane or rubber boot creased.

It's a cylindrical shaped boot that (I'm guessing) moves up and down as well as seals the reservoir. It the inner portion that moves, was creased as it might look if you pushed it down on the edge versus the center.

I popped it back up, put the cap on and the brake lever travel was better but still not right.

I changed the fluid over 2 years ago and just started having an issue within the last 6 mos or so. Why, all of the sudden, would it do this? It was working fine.
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post #2 of 4 (permalink) Old 08-17-2005, 10:58 AM
Join Date: Jul 2004
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change the fluid, bleed the system,,,,,if its still a problem then you might have to get a master clyender rebuild kit....but id just change and bleed the system first
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post #3 of 4 (permalink) Old 08-17-2005, 11:38 AM
Join Date: Jan 2005
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As well as changing the fluid, that could have picked up some moisture over the spring and summer from heat and humidity cycles. Take a look at pad thickness and rotor thickness they also impact how far the piston travels to create braking forces.

Good luck and be careful with them brakes .

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post #4 of 4 (permalink) Old 08-17-2005, 01:16 PM
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Join Date: Jul 2004
Location: SE Michigan
Posts: 38,916

New Syn brake fluid DOT4
New brake pads?
bleed the brakes... both calipers and the banjo bolt (just for you Jack)

When I just did mine I bled the crap out of them. I also took the calipers off the bike pumped them out more then pushed them back in while bleeding thru the caliper bleeder.

Also make sure all your brake lines look good and the ends are nice and tight.

aka Gas Man

Was: 2002 Kaw ZX-9R

is me till the
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