Replacing brake lines,Bleed or fill from bottom? - BMW Luxury Touring Community
 
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post #1 of 6 Old May 26th, 2010, 9:44 pm Thread Starter
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Replacing brake lines,Bleed or fill from bottom?

Replacing old brake lines with spieglers. Is it better to bleed from top down or fill from bottom up?

Thanks,
John

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post #2 of 6 Old May 26th, 2010, 10:28 pm
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Re: Replacing brake lines,Bleed or fill from bottom?

Believe the typical way is reservoir to bleed port. My guess that would still be preferable just in case there is any debris/contamination in the lines. Would rather have the debris heading out the bleed port than back up through the master cylinder with a chance of lodging in the wrong place.

Jim H.

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post #3 of 6 Old May 27th, 2010, 5:45 am
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Re: Replacing brake lines,Bleed or fill from bottom?

Quote:
Originally Posted by jrh2020
Believe the typical way is reservoir to bleed port. My guess that would still be preferable just in case there is any debris/contamination in the lines. Would rather have the debris heading out the bleed port than back up through the master cylinder with a chance of lodging in the wrong place.

Jim H.
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post #4 of 6 Old May 27th, 2010, 9:29 am
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Re: Replacing brake lines,Bleed or fill from bottom?

BMW pushes it up, But that's when they're new...

After changing brake lines it will be easier to get the air out if you go up.

It'll take a lot of conventional bleeding to get all that air out....Like a power bleeder....The faster you can move the brake fluid thru the lines the less time the air has to rise back into the line...

So normally I'd say bleed conventionally. But in this case, I'd push..

I would pull the banjo fitting from the master cylinder. and start by getting that good and cleared out of any debris if you're worried about the master cylinder...


John

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Last edited by JPSpen; May 27th, 2010 at 9:37 am.
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post #5 of 6 Old May 27th, 2010, 12:11 pm
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Re: Replacing brake lines,Bleed or fill from bottom?

For the wheel circuit lines it is best to just fill the reservoir and let the pump cycle the fluid out to the caliper. Just keep it full of fluid. Then once you have clean fluid there run a hose from the caliper back to the reservoir and run the pump until the bubbles are gone. For the control circuit lines you might be better served pushing it up fromn the ABS unit to the master cyclinders.

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post #6 of 6 Old May 27th, 2010, 6:35 pm Thread Starter
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Re: Replacing brake lines,Bleed or fill from bottom?

Thanks for the input
John

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