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post #1 of 8 (permalink) Old 07-23-2019, 05:53 PM Thread Starter
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Need help!

I have a 07 zzr600 motorcycle, my front brakes are out. When I’m not moving they build pressure, but when Im commuting somewhere they disappear. No pressure or anything. What could it be?
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post #2 of 8 (permalink) Old 07-23-2019, 07:35 PM
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Try changing out the fluid and bleed it.

2006 EX500r
Purchased new in July 2006, 0 miles.
Miles as of January 2019 102,137 miles
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post #3 of 8 (permalink) Old 07-23-2019, 09:32 PM Thread Starter
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I’ve done that multiple times.
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post #4 of 8 (permalink) Old 07-25-2019, 08:52 AM
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sounds like a warped rotor
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post #5 of 8 (permalink) Old 07-25-2019, 01:20 PM Thread Starter
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Wouldn’t I still have pressure and wouldn’t the bike shake whenever I’d pull on the break?
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post #6 of 8 (permalink) Old 07-25-2019, 01:22 PM
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Wouldn’t I still have pressure and wouldn’t the bike shake whenever I’d pull on the break?
Probably but not necessarily.
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post #7 of 8 (permalink) Old 07-27-2019, 03:02 AM
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Jack up front wheel, use a pencil or some sort of pointer, spin the wheel and hold the pointer close to the rotor you should see the gap modulate, if it is a long warp it will be gradual.
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post #8 of 8 (permalink) Old 07-31-2019, 01:52 AM
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I think you have a blown ring on your master cylinder. It can create the illusion of pressure until you actually use the brakes and then lose pressure when the fluid passes by the piston. I blew one on a Harley Sporster when I had to make an emergency stop on the freeway. You can replace the internals with minimal time and skill. A rebuild kit should be cheap. All the bleeding in the world won't cure a blown master cylinder.
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