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6 Series DIY
6 Series Do It Yourself (DIY) forum.

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Old 12-12-2011, 08:34 PM
bcorwin bcorwin is offline
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Lost brake pressure after bleeding brakes

Apparently while bleeding my left front brake after upgrading to SS hoses, the reservoir ran dry and now I have no brake pressure at all. Everything was fine after I finished the right front, but the left front stumped me. Refilled reservoir and continued to bleed left front but never got pressure back.

Do I have to bleed the whole system again?

Which wheel do I start with and how do I know if I got the bubble out?
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Old 12-12-2011, 10:24 PM
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Yorgi Yorgi is online now
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Mein Auto: '04 M3 / '06 650i Cab
Quote:
Originally Posted by bcorwin View Post
Apparently while bleeding my left front brake after upgrading to SS hoses, the reservoir ran dry and now I have no brake pressure at all. Everything was fine after I finished the right front, but the left front stumped me. Refilled reservoir and continued to bleed left front but never got pressure back.

Do I have to bleed the whole system again?

Which wheel do I start with and how do I know if I got the bubble out?
Sorry to hear about that, it's a painful mistake. If you let the reservoir run try you will have a massive amount of air in the lines and the brake pedal will go to the floor.

It is a MAJOR pain in the arse if you let the reservoir run dry because now you have air in the TOP/FRONT of the line that you need to bleed all the way down to the caliper. When you install new SS lines you only let a bit of air into the end of the line by the caliper and that is easy to remove.

You will probably need at 2 quarts of brake fluid (or more) to get all the air out. Start over at the right rear, left rear, right front then left front. It is A LOT easier to put the car on jackstands and do all 4 wheels in one shot. If you have issues it is much easier to start over when all 4 wheels are off. Check the reservoir level mid way though each rear wheel.

I would have your helper pump at least 10 to 15 times per rear wheel to ensure you get all the bubbles out. Keep going until you see no bubbles.
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Last edited by Yorgi; 12-12-2011 at 10:28 PM.
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