| Originally posted by andyb |
| Originally posted by DaveO749R |
I have experianced this a few times I suspected air trapped at the top of the banjo connection to the master cyclinder.
Try the following in this order.
1. Pump the brake lever a few times and tie wrap the lever back hard against the bar and leave it over night. Hopefully the air will move up and into your master cyclinder. If not move the bike into the sun and let the warm sun heat up master cyclinder hoping the trapped air inside expands and then moves up into the cyclinder. Sounds daft but it works.
2. Use a syringe (cost coppers from a local store) attach the bleed hose to the end fill it with fresh fluid connect it to your caliper bleed nipple and force the fluid up through the system into your master cyclinder. Use a reasonable sized syringe to ensure enough fluid is pushed through the system ensuring no air remains (oh and don't forget to keep and eye on the expansion bottle as the fluid comes up empty it with a second syringe).
Just keep trying u will get there in the end.
I would challenge the use of "forcing fluid in with a syringe as it would inevitably have air in it.
However, i would use a syring to draw the fluid through by attatching it to the bleed pipe. This does work and will draw out the air as well as you new clean fluid. With the undrslung rear calliper, you do need to unbolt it and mount it on top of the disc to bleed!
We've used the force through method for quite a few years on our pro race team downhill bikes, its how the brake manufacturer race techs do it.......
if you are concerned keep flicking hose and lever just to let any last drops of air out but even if you don't it'll still work a lot better than conventional bleeding. I've never seen them suck fluid through with a syringe, I'll try and check tomorrow and find out why they don't do it that way.