Post #9
Sounds like you really need some help/adult supervision from someone with actual experience of working on automotive braking systems. Air does not work its way out by itself. Nor can you bleed the system from the M/C.
Starting from the furthest caliper away, NS rear caliper, depress the pedal hard, keeping pressure on the pedal crack open the bleed nipple on the caliper and drain out some fluid, use a clear pipe into a glass jar of suitable size. Its a good idea to put a bit of brake fluid in the jar to start with and keep the end of the pipe submerged so no air can get back into the syatem. With the bleed scerw open and pedal down the pedal will sink to the floor. Get your helper to keep his foot on the brake as you nip up the bleed screw, this will stop allow him to relaease the pedal for another pump without sucking any dirty fluid or air back into the system.
Repeat the process of press pedal, undo nipple, redo nipple, release pedal, press pedal, undo nipple...until fresh, clear bubble free brake fluid is all thats coming out the pipe. (If you are doing this with the car jacked up on stands and the rear wheel off you will need to push up on the drivers side trailing arm as the load bias valve will shut off if the arm droops down, stopping any fluid getting to the rear calipers)
Move then to the OS rear and repeat the process, then the NS front and finally the OS front, its pretty straightforward but its easy to get air trapped in the system and you may need to do this a couple of times to get the pedal to be properly firm.
Keep the top off the brake fluid reservoir and put some rags around it to catch any spilt fluid as it may burp out the odd bubble as you bleed the system, bear in mind that the level will need to be topped up regularly as you bleed out the old fluid. The reservoirs capacity is small and if it runs out and sucks in any air halfway through the bleed up process you will have to start right from the beginning (ball ache to be sure!) it just worries me when people tackle important saferty critical jobs like this without full knowledge of what they are up against. Follow the process above and its an easy job.
If you don't have a helper, Halfrauds sell an EZ Bleed pressure bleeder which makes is possible to pressurise the system yourself, same applies, dont let it run dry though as it will pump fresh air into the system and put you back to square one
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flynn_
Posted 12th Jun 2011 at 14:06
Okay nother problem now, the MC seems to have emptied itself while the brake pipe was undone! Didn't think it lost that much fluid...I need to refill it next weekend as I'm at work during the week. I am thinking just to undo the bleed valves and keep topping up the MC with brake fluid, will that get all the air out? Gravity will do the rest I would have thought? 
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Have to fit it on the weekend, he's getting the bus to work for now!
