Brake Lever Loses Pressure - Honda Motorcycles - FireBlades.org
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post #1 of 3 Old 08-06-2019, 10:02 PM Thread Starter
 
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Brake Lever Loses Pressure

I have a '00 929, I put steel-braided lines on the front end 1 year ago and at the same time, replaced the pads, and fluid with DOT 5.1. The initial bite and brake performance was amazing up until about a month ago. I was had to ride home in the rain after work which wasn't a big deal until I noticed that I had to pull the lever further to get the brakes to have any effect. I let the bike sit for a few weeks and I come back to check the lever and it goes all the way to the bar. I vacuum-bled each caliper and got a lot of air out on both sides. The brake lever had pressure again, but it is not the same as when I replaced the parts. After a few days of riding, I notice the same thing happening and I have to pull the lever further to get engagement. I have CRG shorty levers and last year I had it set to the fourth position (away from the bar). Now I have it fully extended in the sixth position in order to make it work.

Any help is appreciated!
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post #2 of 3 Old 08-07-2019, 2:48 AM
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Re: Brake Lever Loses Pressure

It sure sounds as if you have an air leak somewhere in the system. First point would be to check all the barrel joints for correct torque. Might there be a washer missing from one of them?

Second point would be, was the system okay before you installed the CRG levers? Could there be a fault in the fitting at the Master Cylinder point?

Third point, is there anything significant that happened a month ago that might have affected hoses or front end?

I am fairly certain your problem can only be cause by air getting in the system!
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2018 CBR1000RR SP2 / 2004 CBR1000RR / 2003 CBR954RR / 2001 CBR929RR (Erion Racing Edition)
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post #3 of 3 Old 08-08-2019, 10:23 PM
 
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You may need to rebuild your brake master cylinder. Parts are cheap and it can be done with basic tools and circlip pliers. Given the age of the bike I would say it's time. My old 929 had this issue about a year ago. You can also somewhat bleed the Master cylinder by holding the lever and cracking the banjo bolt.

2001 929RR
1993 Kawasaki KLR 650
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