Brake fluid flush

[greiswig]

Decided to flush my brake fluid, since it was looking a little brown. I used a power bleeder, and pumped it up to about 12psi. Got all the brown fluid out, but…

Man, I swear air was somehow getting into the hose around the bleeder valve. I sat and watched several of them for what seemed like forever, and more bubbles. Jiggle the bleeder screw, and they’d go away for a bit, then come back.

Anyone here have a similar experience trying to bleed the brakes with a pressure bleeder?

 

[Worzella]

I used a tip once that was helpful. A tiny bit of grease on the bleeder threads and then screw it into the spot you need it to get fluid moving. Tiny amount..don't want a big glob getting into caliper. I think it seals the threads enough to keep air out

 

[Rover Range]

Teflon plumbing tape works great too.

 

[GunsAndRovers]

1. Don't let the pressure drop too far on the pressure bleeder
2. Ensure you have plenty of brake fluid in the pressure bleeder
3. Ensure the feed hose is fully submerged
3. Ensure you have a tight seal on your drain line around the bleeder valve
4. Ensure the drain line doesn't have a fissure
5. Ensure you have no rust pitting/cracks in the brake lines & caliper pistons--if you're not leaking brake fluid this shouldn't be a concern.

 

[TexanRover]

I've dealt with the same. It helps to raise the discharge hose outlet above the height of the bleed screw. I believe air can siphon through the bleed the screw giving a false indication of air in the lines.

On a related note, I have 2010 RRS that required periodic bleeding to remove air from the lines. Bled them constantly, replaced the master cylinder, etc. Ended up being the ABS pump. Somehow it was introducing air into the lines. Replaced the ABS pump and that sorted it.