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Discussion Starter · #1 ·
So I was riding on the freeway and out of no where I lost all pressure in my front brake. Now when I pumped the brake lever it started to get pressure again. I bled the brakes and checked for leaks all lines are intact and nothings leaking. Whats really weird is it will sustain its pressure until the bike starts moving then the pressure goes down and i have to squeeze the lever a couple times. Only other thing i could think of is replacing the brake master cylinder any other suggestions? and yes i have plenty of brake fluid
 

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bleed the master first, then again on the calipers, If all else I say it must be the master cylinder.
 

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Assuming no leaking fluid it would likely be air trapped at the master.

No leaks???

The movement of the bike I'm assuming not walking pace, your talking riding/vibration? enough to move an air bubble.

As RI-Gixxer said, bleed the master (if you have a bleed nipple on it).... best case have the nipple at the highest point when bleeding, i.e. remove the brake and hold it such that air will travel up to the nipple.
 

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JUST had this happen to me as well, although I'm pretty hard on brakes. Did you have a tire changed recently. Because I bet you $100 your rotors are warped. It confused the hell out of me as to why they would hold pressure, and then you just roll the bike and it gets lost. It was my rotors that were warped. Put new ones on, and fixed the problem. The rotors were causing the pistons to be decompressed and would have to recompress by pumping the brakes like you said. Let me know how this goes via PM as I will probably lose this thread.
 
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