DIY: Brake fluid flush

[Chi]

I tried this with mate last time, got alotta air bubbles.

Tried to let it bleed again, but still got air bubbles.

Any way to get rid of it?

[wynode]

Air can enter the system 2 ways

1. You don't top up the reservoir before it goes too low
2. You let air enter the system via the bleed nipple.

[tinkerbell]

I tried this with mate last time, got alotta air bubbles.

Tried to let it bleed again, but still got air bubbles.

Any way to get rid of it?

just to add - this can also be due to air entering via the thread of the bleed nipple,

remove the nipple and apply some plumbing tape (PTFE) to the thread to seal it