Quote:
Originally Posted by RimasRS
Thanks. So you are saying I have to suck out oil from reservoir and then pump it out with pedal to make system absolutely empty full of air. Refill it with new fluid and bleed it? What about clutch line?
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NO, don't do that! Just try to remove as much of the old brake fluid out of the reservoir before putting new fluid in. The new fluid will push the old fluid out of the lines. Keep an eye on the level of fluid in the reservoir and make sure it never gets below 1/4 full. You do not want to introduce air into the brake lines, especially at the reservoir. If you do, you will have to bleed the whole system again to make sure the lines are free of bubbles. Keep in mind that brake fluid is highly corrosive and will destroy your paint. Have a lot of rags on hand, and wash you hands if you get brake fluid on them... Otherwise you will leave permanent finger prints on whatever you touch.
Get a bleeder bottle with a clear hose to attach to the bleed valve. Depending on how old the fluid is, you will see when the new fluid makes its way through the system. Whe new, the BMW brake fluid is yellow. When old, it looks more like tan to me. I use Castrol SRF which is almost clear when new, and slightly darker when old. The clear tube will also allow you to see if all the air has been removed from the lines.