Hi there, 
I've done a few bits to my daughters GasGas - bought off the internet...never again. 
I've not had much luck getting the front brake to do it's job. 
It worked when first bought, but not very weell, so I replaced the very worn pads and flushed it throuough with fresh Dot4. 
Still the same, the lever comes back to the bars with a bit of effort, giving enough pressure to slowly stop the bike. 
I even bled them through last night from the banjo union bleed nipple using the Gasgas video recommended method with a syringe, but still no difference. 
Would i be right in saying that I need to strip the M/C and replace the seals ? 
Any help/advice would be appreciated. 
Cheers, 
  Ewan.