Brake Master Cylinder Problems of Mazda CX9 - part 2

The contact owns a 2008 Mazda cx-9. The contact was driving 20 mph when the brakes were depressed and the vehicle failed to stop properly, and crashed into a gate. The crash caused no injuries and the police were not contacted. The same failure recurred on multiple separate occasions and without warning. The vehicle was taken to the dealer where the dealer confirmed that both the master cylinder and power booster were leaking brake fluid and needed to be replaced. The manufacturer was contacted. The vehicle was repaired. The failure mileage was 68,000 and the current mileage was 68,200. Updated 04/26/lj according to the repair invoice, the brake booster was leaking due to corrosion from brake fluid leaking from the master cylinder into the booster. The brake master cylinder and booster were replaced. Updated 04/27/12.

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2008 Mazda cx-9 has a master cylinder machine problem. We replaced these items in August of 2011 and in less than 16000 miles we have the exact same failure. Nhtsa action number pe11026. Mazda has identified a problem with a manufacturing process dor the master cylinder primary plunger that could result in inappropriate surface finish. We are in the process of replacing these exact same parts today! this is an ongoing safety problem and the Mazda dealer told me the vehicle was unsafe to drive and the brakes could fail at any time. Our brakes not only had a soft feel but the distance to stop was greatly increased. We have had to replace the master cylinder and vacuum power assist twice in sixteen thousand miles at a cost of approximately $1300. 00.