need help with brake

[coggie]

new brake piston and seals
new master cylinder
nothing wrong with lines
no bubbles in the fluid,

yet no pressure at the lever

help!?
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2005 Derbi Gpr Replica, Airsal 70cc kit, K&N, Doppler Racing Crank, Metrakit Pro Carbon Exhaust, Metrakit Carbon Reeds - Currently Being Build (Project)
(SOLD) 2005 Derbi Senda SM Limited Edition 656/999 (SOLD)

[Itchy]

Bleed it out again? As you first get biggish bubbles when you bleed, then you get tiny bubbles the kind you get in beer. Which collectively can add up to a lot of air in the system.

Firstly grab the caliper and give it a shake. Then bleed it, tube on the nipple, tube submerged in brake fluid, once the big bubbles are gone, squeeze the brake lever 5-10 times per release of the nipple. You should usually get pressure after doing this 10+ times. As a final air out solution tie the lever to the bar over night, then release the nipple once more.
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Spain 2008France 2007Big one 2009 We all die. The goal isn't to live forever, the goal is to create something that will. In the end, your life will flash before your eyes. Make sure it is worth watching.

[coggie]

will try that tomorrow, cheers, have the lever currently tied to bar apparently it makes the air if any rise
____________________
2005 Derbi Gpr Replica, Airsal 70cc kit, K&N, Doppler Racing Crank, Metrakit Pro Carbon Exhaust, Metrakit Carbon Reeds - Currently Being Build (Project)
(SOLD) 2005 Derbi Senda SM Limited Edition 656/999 (SOLD)

[gonzo]

x2 ...but if that dont work try takeing the pipe of the master cylinder
and put your finger over the hole were the pipe was and try bleeding it at the master cylinder 1st it mite be thats its new and just needs bleeding there 1st ,thats what we do on cars thats gets new master cylinder
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the gonz

[coggie]

ok cheers will try that if other way does not work tomorrow
____________________
2005 Derbi Gpr Replica, Airsal 70cc kit, K&N, Doppler Racing Crank, Metrakit Pro Carbon Exhaust, Metrakit Carbon Reeds - Currently Being Build (Project)
(SOLD) 2005 Derbi Senda SM Limited Edition 656/999 (SOLD)

[map]

Another trick is to gentle (that's gently) tap the calliper(s) and lines to loosen any air bubbles. I generally use the handle of a screwdriver but its personal preference.

On tieing the lever back to the bars (or if rear put a brick on/tied down the pedal) overnight usually works for me.

HTH
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...and the whirlwind is in the thorn trees, it's hard for thee to kick against the pricks...
Gibbs, what did Duckie look like when he was younger?

[coggie]

being really fun, not, process of elimination, not master cylinder, not calipers, new bleed nipples old ones where crushed (stupid garage), splitter tube... bingo.

Its a 1 into 2 lines via a splitter tube, splitter tube keeps seeping fluid from the banjo bolts each end, no matter how tight (35nm max)
been advised to just change it to 2 lines from the master cylinder, so just need to measure pipe lengths and new banjo bolts,

thanks to everyone for help
____________________
2005 Derbi Gpr Replica, Airsal 70cc kit, K&N, Doppler Racing Crank, Metrakit Pro Carbon Exhaust, Metrakit Carbon Reeds - Currently Being Build (Project)
(SOLD) 2005 Derbi Senda SM Limited Edition 656/999 (SOLD)