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Date: 5-14-08 10:26
From: skylund in Utah! 
Subject: Constant air in brake lines (tried searching)  
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I just replaced my brake master cylinder with one i had from a parts car. I tried using a pressure bleeder I built to bleed, but at 20 psi, the fluid barely eeked out of the calipers and drums. (Im guessing this is an issue with my flexible lines)
Switched to bleeding by pumping the pedal, and I get a healthy flow, but every time the pedal pushed down, what looked a new spurt of air bubbles was seen coming out. By the time the pedal was at the bottom, it looked clearer, than the pedal rises, and when pushed, a new set of bubbles. This continued for about 10 pumps with no improvement.
Is this a problem with my master cylinder? It seemed to work fine in the parts car. This is my first time doing anything like this, so any help is appreciated.
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'71 inka 'Ingrid'
'72 chamonix 'Fritz' (parts)
'89 325i 'Friedrich'
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Date: 5-14-08 11:11
From: skylund in Utah!
Subject: Re: Constant air in brake lines (tried searching)
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No advice is too basic, I appreciate the help. I must have misread the manual, I thought it was pump (depress, release) until line is clear , when pedal is down (the last time), close the screw. So, its actually open screw, push pedal down, close screw, lift pedal, repeat.
Wow, if its really just an issue of me not knowing how to bleed brakes, I am embarrassed but hopeful that that will solve it. Sorry for the amature post, and thanks for patient replies.
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'71 inka 'Ingrid'
'72 chamonix 'Fritz' (parts)
'89 325i 'Friedrich'
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Date: 5-14-08 11:35
From: JLENHAM in Winston-Salem, NC 
Subject: Re: Constant air in brake lines (tried searching)
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You are closing in on the correct method. My personal experience is that the 2002 is not an easy car to learn on either, I am guessing your front calipers have the 3 bleed nipples? All my other vehicles bleed fine using a Mityvac hand pump and sucking through the system. I know, many folks will disagee with this method, and it did not work well on the 2002, I went back to the 2 person pump the brake method.
So, the task is, with the bleeder closed, have helper pump brake pedal and hold, open bleeder and quickly close again (about 1-2 seconds), helper will feel the pedal go down under their foot, but probably not all the way to the floor. Have the helper pump the pedal up again, hold and repeat open/close until there is no more air visable in the drain tube.
I believe the correct bleed order is passenger side rear, driver side rear, passenger side front, driver side front. If you have the 3 bleeders per front caliper I believe the order is outer low, inner, outer high.
If you have two passenger side calipers, with one installed upside down on the drivers side...don't ask...but this creates another issue!
Good luck!
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