Brake Master Cylinder Problems of Lincoln Navigator

The contact owns a 2017 Lincoln Navigator. The contact stated when starting the vehicle, the vehicle lost brake functionality. The brake fluid warning light illuminated. The vehicle was taken to the local dealer to be diagnosed. The contact was informed that the brake master cylinder and brake booster needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 70,500.

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Takata recall. At a slow speed, with the foot on the brake, vehicle accelerates. Speed is generally under 10 mph and has happened during turning. . . Either left or right. Specifically: it happened once turning left into a parking spot; it happened making a slow right hand turn on a street; it happened again during a left hand turn into a parking garage. We took it to a shop and the mechanic drove it. It happened to him as well, but I don't have the specifics for the one incident, but he also experienced the brakes not engaging normally to the point where he had to push extremely hard on the brake to stop the vehicle. The vehicle is still with the mechanic. I'm not sure if he's finding the exact cause of the problem. The master cylinder has been replace so far, but 3 of the 5 or 6 incidents occurred afterwards. We did contact the local Lincoln dealership service department and they told us they have never heard of a similar incident. We just purchased the vehicle second hand and have only owned it for 2 weeks. It started the day after purchase. It's dangerous and we don't know where to turn since we bought the vehicle "as is". Will follow up with the mechanic tomorrow, 05/13/2019.

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Brake booster and master cylinder no good. Brake fluid costently disappearing, no leaks under truck but once empty or close to low line have to press breaks to the floor just to try and slow down to stop. . . Both in city and highway, in motion and while parked.

See all problems of the 2012 Lincoln Navigator 🔎.