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sprinkles08, ASE Certified Technician
Category: Car
Satisfied Customers: 22986
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Mazda CX-9XXXXX Our 2008 mazda cx9 has had a complete

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Our 2008 mazda cx9 has had a complete brake system failure. abs, master cylinder, booster, brake pads etc.. the car is not that old-70,000 km's. Is this a possible faulty brake system- common in 2008 models- we have done our research. Mechanics are baffled- next step?
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If the master cylinder has been replaced with a known good unit and the system has been properly bled for sure then it's not out of the question that the ABS hydraulic control unit could be causing the problem. It's possible for it to have an internal leak or stuck valve which isn't allowing the master cylinder to properly pressurize the system.

The brake pads may have needed to be replaced because they were worn or had some other issue, but the pads couldn't cause the pedal to be spongy. The brake booster wouldn't cause it either. The master cylinder, air in the lines, or the ABS hydraulic control unit are the items that can cause it.
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