5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
The master cylinder seals are probably leaking fluid internally, not holding the pressure. I'd get it fixed asap. Unless you have a leak and the fluid in the reservoir was emptied, you shouldn't have air in the system. You can try bleeding them first though.
my 528 has a soft pedal and had the dealership look at it and they said it was normal had them bleed it when they replaced the rotars and pads but it did not change then i drive my neighbors 540 and it is even softer but when i drive my dads z4 it is hard as a rock i just don't get it
I wouldn't mix the blue with the original. They have completely different characteristics and boiling points. Flush the system to rid of the old and then put in the blue. Have you had any abs/brake lights come on when this "slip" happens? Flushing the system completely and replacing the fluid should help with the soft pedal.
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