Brake Sensor problems of the 2006 Jeep Liberty

Esp problem, I been working on the breaks, master cilinder, calipers, brake control, sensors and I don't have a clue what to do.

Esp/bas malfunction on my 2006 Jeep Liberty. When I apply the brakes the vehicle does not want to break and has caused me to loose control of the vehicle. The vehicle will shake and make a grinding sound. I took it to the dealership and they said it was the rear end sensor and charged me $289. 80 for repairs. They also said they have no idea what is causing the grinding sound and my brakes are fine. After looking this up online, it appears that this a very common complaint and a serious safety issue.

The contact owns a 2006 Jeep Liberty. He stated that he experienced unwanted abs activation, when the air bag warning light illuminated on the instrument control panel. With the increased stopping distances the risk of a crash could occur if the abs activated without warning. An authorized technician rewired the abs since the air bag sensors failed. The vehicle identification number was unavailable. The manufacturer was notified, and he is waiting for a response. The failure mileage was 15,000 and the current mileage was 30,000.

- the contact owns a 2006 Chrysler Jeep Liberty. The contact received recall o6v288000 for the lower ball joints. The current mileage was 20,000. The dealer/mechanic replaced the steering sensor, as well as the front lower ball joints. Within a half mile after leaving the dealership the vehicle would not turn left, and she heard a grinding noise. The traction control sensor came on. The vehicle was returned to the dealer\manufacturer and the steering sensor was changed again along with the rear brake sensor. The vehicle continued to have steering problems. The contact had taken the vehicle back to the dealer/manufacturer.