One problem related to abs brake fail has been reported for the 2009 Jeep Patriot. The most recently reported issues are listed below.
While driving vehicle, Patriot began to make a weird noise and when braking on any incline the brake pedal would fell as though it was bouncing and you could hear a ticking noise from passenger front area of car. Shortly after the abs/traction control light came on. After having the car scanned at a local shop, it wasn't reading what was wrong. They reset computer and after driving over 20mph, the lightscame back on. I recently took it into a local mechanic shop where they analized the computer system and brake system. The back right passenger tire abs sensor had failed and needs replaced along with the lower control arms and ball joints on the front right side estimating cost to fixis around $1000. 00 for a car with 57,500 miles now.