Brake Antilock Wheel Speed Sensor problems of the 2007 Lincoln Navigator

Make: Lincoln model: Navigator year: 2007 issue: complete brakes failure description:\ on several occasions, the brakes have completely failed. We have observed that generally this failures occurs when the vehicle is going downhill at about 30 - 45 mph speed. The problem suddenly appears with no prior indication of anything malfunctioning, lasts for several seconds and then disappears. Problem description: at speeds mentioned above, the antiskid light comes on with whirring / grinding noises and the brakes do not respond when the brake pedal is pushed. The conditions remains for several seconds, usually about 5 - 10 seconds periods when the brakes do not work at all. Afterwards, the brakes start to work normally. The dealership has not been able to reproduce this condition and diagnose any issues, although this very problem has been reported and discussed by other owners in various forums on the internet. Not being able to stop the car will result in an accident causing serious injuries and death. The dealership replaced the master cylinder and the brake booster. However, other Lincoln Navigator owners have reported the issue to be related to the speed sensors. Replacement of master cylinder and the brake booster has not fixed the issue.

The contact owns a 2007 Lincoln Navigator. While driving 40 mph, the contact heard a clunking noise and the abs activated without warning. The dealer stated that the abs sensor caused the failure. They replaced the sensor; however, the failure recurred. As of December 13, 2007, the dealer had not repaired the vehicle. The failure mileage was 5,000 and current mileage was 22,000. Updated 01-10-08. The consumer stated the problem has occurred 4 additional times. Updated 12/31/07.