Brake bleeding 101

[Monte Motorcycle]

OK the new tire and bearings are all done. I also replaced the rear brake rotor, the stock one was grooved quite a bit.
It only had 10K miles on it and I had used only the soft organic-dusty pads. I have put on a Sunstar floating rotor and new sintered bronze pads-same as on front.
I have bled the brakes several times, thought I had a air bubble. The system bleeds down, I get a hard pedal and the pads stop the bike. But if you go faster than walking speed the pedal goes right down to the stop and no brake at all ?
I have bled brakes before and had no problems. Any ideas ?

 

[lee]

you haven't mixed different type brake fluids have you? Also, its easier the change fluids by pushing the fluid in through the bleeder with a syringe and then topping up the MC.

 

[Mad Dog]

I've always used a Mighty Vac. Can't go wrong.:2thumbs:

 

[MARV]

must be a lot of air if the pedal is bottoming out.


like Lee said, a big syringe from a feed supply and feed it thru the bleeder with a hose.

i have a mighty vac also but the syringe is quick.

 

[RRRUFF]

You may have a master cylinder problem. If air is present the peddle should be spongy. If you press the peddle down till it gets hard and then it gradually fades your seals maybe bad.