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Bleed nipple at master cylinder

Posted: Mon Apr 25, 2022 2:09 pm
by Doctor T
Can someone tell me why the front master cylinder has a small bleed nipple fitted?. Can't seem to find any information regarding this.

Re: Bleed nipple at master cylinder

Posted: Mon Apr 25, 2022 2:38 pm
by bicyclenut
Can't tell you the technical reason for this, but when I replaced a brake line to fit some barbacks, it was the only way to get the air out of the brake line. I tried bleeding at the wheel cylinders multiple times and no go. Found info about using this bleeder nipple and did a typical bleed procedure a couple times and the air was gone. Must allow for bleeding when the master cylinder is empty or replaced. All I can say if if you are having problems bleeding the lines at the wheel cylinders, use this as a final step and it works. When I did a normal fluid replacement and brake bleed last week I did not have to use it.

Re: Bleed nipple at master cylinder

Posted: Tue Apr 26, 2022 12:43 pm
by Doctor T
Make sense as the air rises to the top. Just cant remember seeing the set up before. Cheers