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Cant get the front brakes to bleed

NPS

NPS

Cruisin' Guzzisti
GT Contributor
Joined
Dec 11, 2008
Messages
262
Location
Churchdown, Gloucester, UK
I installed a new caliper on my B11 on the left front. I tried to get all the air out and bleed and in the process ran the master cylinder dry and sucked in air.
Have spent 2 hours trying to clear air but none is coming out and the calipers are not even moving.

Im thinking I need to place the calipers above the master to get this air to move. Can anyone give me some help and suggestions?

later....

I have moved the calipers (still attached to the lines) to droop over the handlebar next to the master cylinder. No extra air as yet has come out after bleeding a little. When the bleed nipple is open on either caliper, the fluid in the plastic bleed tube moves about 1cm for each pump over about 5 seconds (very slowly). Calipers are not extended or working against anything as yet as there is not enough pressure to move the pistons. Begining to think the master seal is damaged or the master cylinder is blocked or has air. There is no disturbance of the fluid in the master cylinder when I pump the lever.
 
1. Pull the bleeder valve the whole way out and make sure it is not plugged.
2. Go to the auto parts store and buy a vacuum brake bleeder. Ther run about $30 but well worth it.

I just finished bleeding the brakes on my V50 earlier this morning. Some of the metal hoses were gummed up and so were the bleeder valves. I ended up seperating every hose metal and flexable and used the vacuum pump to suck out the obstructions. Put everything back together, hooked up the vacuum to the bleed nipple and bled the brakes as normal.
 
Since you introduced air at the MC, turn the bars full left to get the MC high. Make sure you have fluid in the reservoir. Partially press the MC and release. You should see air bubbles escape. Repeat until no bubbles then bleed as normal. BTW, The vacuum bleeder Perazzimx14 suggests does make the job easier.
 
Thanks Jon
Turning left and partially pumping was my first action after refilling. I'm begining to think the m/c seal is the problem.
 
NPS said:
Thanks Jon
Turning left and partially pumping was my first action after refilling. I'm begining to think the m/c seal is the problem.
Click to expand...

Did that remove any air? Sometimes just leaving the bike overnight with the bar to the left will let the air escape if it hasn't gone too far down the line.
 
I partially pumped for a few minutes until no more tiny bubbles appeared. I tink I need to check that the M/C can pump and my lines are clear as not much is happening at the calipers.
Just ordered a vacuum bleeding tool for next week in case Im still stuck.

later...

I just tried pumping the M/C and cracking the banjo bolt adjacent and got loads of air out and a fountain in the M/C. I think the problem is solved. Obvioulsy my manual bleeding was not fast enouth flow to carry the air downwards. Conclusion is to not introduce air at the master cylinder and use a vacuum bleeding kit and if I do introduce air then bleed the bl..ding banjo first!!!

Thanks Perazzimx14 and John for your help.
 
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