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Premium Member
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Still air in the system, probably in the banjo fitting at the master cylinder. Try moving the MC reservoir so the fitting is below the cylinder a bit, then slowly squeeze the lever until tight, or against the grip, hold several seconds, then let it snap back. This should pull a bubble into the MC, where it can be expelled into the reservoir by gently moving the lever in and out, then start again.
 

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Save them all!
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There should be a very tiny little hole somewhere in the bottom of the master cylinder reservoir - not the larger hole that the fluid goes into, but a very tiny relief hole. Sometimes this gets clogged with corrosion or dirt and will result in locking up the wheel.
 

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Premium Member
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10,603 Posts
As above.
Also, a rare possibility for a bike, is the rubber hose collapsing inside. It will allow fluid thru under pressure, but not let it back. Happens on Chevy pick up trucks. How many discs on the front. I am guessing it is one.

UK
 

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Ace Tuner
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4,348 Posts
If the wheel frees up after sitting overnight, maybe look to the master cylinder.
If it doesn't free up no matter how long it sits, maybe caliper/s.

At any rate when stuff like this happens, many times a total overhaul of the hydraulics is the best and longest lasting fix.
 

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Retired twice: Navy and as a govt contractor
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Thank you for following up with the fix. That will help others with the same problem.
 
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