so...recently installed new front master cylinder. Having bled brakes in usual way, it became clear that air remains in the system. I re-bled them, tried lifting the callipers level with the master cylinder, pushed the pads right back in, did the cable tie overnight thing - all to no avail. Calliper seals are fine, no leaks anywhere. I am contemplating fitting a banjo with bleed nipple up by the master cylinder, has anyone else tried this? is M10 x 1.00 the correct thread for this fitting? any ideas at all? TIA Stu
Like @Cream_Revenge said...bleed banjo at m/cyl is the way to go if the m/cyl doesn't already have a nipple.
It will sometimes work if you put the bike on the sidestand and turn the clip ons completely to the left - then leave overnight.
OK, looks like it's going to be bleed banjos. can anyone confirm the thread used? Most seem to be M10 x 1.00, so I imagine that's it, but (I think it's Goodridge) also do M10 x 1.25. which one? TIA stu
Have you tried sucking the fluid thru with syringe and tube at the callipers after cracking the banjos up top.
This always works for me. One of the problems when bleeding front brakes on modern sports bikes is the master cylinder is angled downwards & this makes the banjo bolt/pipe connection higher than the piston & so air gets trapped when the bike is upright such as on a paddock stand. Putting the bike on it's side-stand & turning the handlebars to the left has the effect of lowering the banjo bolt/pipe joint & makes the reservoir higher, which should allow trapped air to get out into the reservoir & so escape. Additionally, if you get your bike into this position gently pump the front brake lever with very, very small pumps, (maybe around 1/4" of movement at the end of the brake lever). This will expel trapped air, but it does take a while to carry this out. I find doing a few small pumps, then leave it to settle for a while & repeat.
