Brake Master Cylinder Problems of Infiniti QX56

Randomly, I will step on the brakes and the brakes begin to pulsate. Then it sounds like grinding sound and the brake pedal loses pressure. Almost like it hit a void and dropped to the floor. I had to try and slow down vehicle to come to a stop. Calipers and pads were all changed, per dealer findings. And it continued. I do not go over 40 mph for fear of this happening again. It's clearly and unsafe situation and the dealer claims they only hear this when people have back brakes. Guess what, I brought it to another Infiniti service center, and they said the same thing even thought the other service center replaced just about everything. Another mechanic, from the service center, took me aside and said this is frequently happening with this model and it is a master cylinder issue from design. Come on Infiniti, fix this!.

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The contact owns a 2004 Infiniti Qx56. The contact stated that the brakes pulsated and made an abnormal grinding noise. The check engine and abs warning indicators illuminated. The vehicle was taken to an independent mechanic where it was diagnosed that the brakes functioned normally. The brake master cylinder was replaced, but the failure recurred. The manufacturer was not notified of the failure. The failure mileage was approximately 68,000.

See all problems of the 2004 Infiniti QX56 🔎.