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

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  #1  
Old 12-19-2014, 04:32 PM
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TimDogg TimDogg is offline
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Mein Auto: 2004 645ci 2008 535i
bleeding brakes

Using a pressure brake bleeder to put the system under 10 psi and hardly anything coming out at a not clogged, wide open bleeder valve.... read something once about using a scan tool to put the system into "bleed mode" i guess this opens some valves or something in the ABS system to allow the system to be bled.... ANYONE?????

my 2004 645ci
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Last edited by TimDogg; 12-19-2014 at 04:56 PM.
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  #2  
Old 12-19-2014, 08:13 PM
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Yorgi Yorgi is offline
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Mein Auto: '04 M3 / '06 650i Cab
Personally I use 20psi. I bleed my brakes at least once a year on all 3 cars and never bother with the ABS unit bleeding.

You do not need to put the system into "ABS bleed mode" unless you are trying to bleed the ABS unit on its own. You can bleed the rest of the system without using any extra software.

I find pure pressure bleeding too slow so I use a hybrid method. Also Zeckhausen recommends the "old school" method with a helper pressing on the pedal since the high pressure with this method results in high speed fluid exit which is much better at carrying bubbles out of the system. I find you will get a harder pedal if you use a helper vs just doing a pressure bleed by yourself.

I use pressure on the reservoir combined with a helper pressing on the pedal to prevent air from getting back in though the bleeder valve, which can happen if the helper lifts off the brake pedal before you close the valve.

This is what I do:
1. Put the car on 4 jackstands with all 4 wheels removed, roll down the windows
2. Extract all old fluid from the reservoir
3. Refill reservoir with fresh fluid
4. Attach pressure bleeder cap and apply 20psi
5. Go to right rear wheel, attach clear hose to bleeder nipple
6. Have your helper press hard on pedal (have them say "pressing")
7. Crack the bleeder valve, have the helper say "floor" when the pedal bottoms, make sure you tell them to hold the pedal to the floor until you tell them "OK to release". Close the valve
8. Have the helper release the brake pedal and start pressing again, repeat step 7
9. When you start seeing clear fluid in the bleed hose, I tap the caliper with a rubber mallet to help release any trapped bubbles, then do a step 7 bleed.
10. Do one last open of the bleeder and close it before the helper bottoms the pedal (ie open valve then close it quickly)
11. Check reservoir level, if low refill. Repeat steps 6 to 10 on left rear
12. Top up the brake fluid reservoir - if the reservoir empties you need to start over from the beginning
13. Repeat steps 7 to 10 on right front
14. Repeat steps 7 to 10 on left front
15. Final top up of fluid

Brake fluid strips paint, make sure you quickly clean any that spills on your paint. I use rags around the reservoir when filling it to catch any spills.
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Last edited by Yorgi; 12-19-2014 at 08:18 PM. Reason: formatting
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  #3  
Old 12-20-2014, 11:41 PM
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TimDogg TimDogg is offline
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I kinda figured that i would end up back at the 2 man mode.....
Thanks for great advice, gonna try your hybrid method.....
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  #4  
Old 12-22-2014, 04:56 AM
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TimDogg TimDogg is offline
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I combined the pressure bleed with a helper with no change to the brake system at all.... i will leave it to my Indy shop as i have'nt the time to be cracking open hydraulic lines to the ABS module and chasing down air bubbles or defective parts all over the place....
but thanks for the advice, i will use it in future bleeding jobs
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  #5  
Old 12-22-2014, 08:25 AM
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Yorgi Yorgi is offline
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Hmm, something must be blocking the lines, I have never had a flow problem on any of my BMWs and I have done many many bleeds since I track my cars. I did the ABS unit once on my M3 and it's a pain in the butt. It made no difference in pedal feel so I've not bothered since.

Did you try a different wheel? Another thing you could try before going to the dealer is complete removal of the bleed valve, there might be a chunk of crud in there that cannot pass through the tiny bleed hole.
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  #6  
Old 12-24-2014, 07:32 PM
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TimDogg TimDogg is offline
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checked all wheels with the same "trickle flow" at each.... All bleed screws are as clean as a whistle too.....
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