Abs Brake Fail Problems of Mazda CX9

2010-11 cx-9 brake booster failure. Rapid onset from first symptoms to complete failure braking occurred within 45 minutes of driving on heavy interstate congested traffic during rush hour. Breaking failure is most significant if breaking is first applied lightly as a cautionary measure. Applying light breaks results in breaking system pressure to rapidly drop disabling assisted breaking within a few seconds. Breaking a heavy vehicle with fail power assist almost always resulted in either insufficient braking, or wheel lockup. (note, abs fails). The assist braking then returns if brake is release for more than 10 seconds providing the brake is not applied. This is a significant safety hazard that may easily result in the destruction of property and death. The defect seems to have been glossed over by the NHTSA in April 2014 when the NHTSA investigation into this failure was closed. It appears that the investigation was closed when Mazda elected to use standard us mail to inform affected Mazda owners that it was 'extending its service warranty' by giving customers 1 year from notice to have the defective part replaced. If the Mazda owner did not receive or act upon the 'extended warranty' within the following 12 months and the brake booster failed, the customer would be responsible for over $1000 in repair costs, serious property destruction or even death. It is shameful that the NHTSA closed it's investigation so quickly on account of such remedial action by Mazda corporation.

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