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sprinkles08, ASE Certified Technician
Category: BMW
Satisfied Customers: 23122
Experience:  ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
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I have a 2006 BMW X5 4.4 I've changed the brake booster and

Customer Question

Ok I have a 2006 BMW X5 4.4 I've changed the brake booster and the master cylinder used a pressure bleeder to bleed brakes all 4 and I still have a weak peddle and no brakes
JA: Have you tried "bleeding the brakes" to get any air out of the line?
Customer: Yes clean fluid is flowing out of all 4 bleeder valves
JA: Are you fixing your X5 yourself? What have you tried so far?
Customer: Yes as I explained I changed brakebooster and master cylinder
JA: Anything else you want the mechanic to know before I connect you?
Customer: Does the rod in the booster need to be adjusted
Submitted: 4 months ago.
Category: BMW
Expert:  sprinkles08 replied 4 months ago.

Hello and welcome to JustAnswer!

If the master cylinder has been ruled out and the problem started on it's own then an internal issue in the ABS hydraulic control unit is likely.

Can you look at the bleeder screw on each caliper and see if it's above or below the brake hose banjo bolt?