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Suspension & Braking Forum by BimmerWorld
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Old 10-31-2017, 12:15 AM   #1
TH330ci01
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Brake booster replace soft pedal!

Replaced power booster and had to take abs system out with all the lines going to it to get access have bleed system 3 times with old school bleed method and used a pressure bleeder at 20 psi twice have good fluid out of all lines with no air but still brake pedal soft.... is air possibly trapped in abs side and has to be turned on with scanner to get pedal back stiff?
Thanks in advance
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Old 10-31-2017, 12:59 AM   #2
BaliDawg
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Air in the master cylinder?
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Old 10-31-2017, 01:25 AM   #3
ewcmr2
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Yep, sounds like the ABS needs bled. Cycling ABS with scanner is correct way but I've had good results with driving car and engaging ABS (a lot) and re-bleeding.
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