One problem related to brake sensor has been reported for the 2013 Infiniti JX35. The most recently reported issues are listed below.
Vehicle is equipped with forward collision prevention. While driving with cruise control on, vehicle will occasionally brake even though there is no vehicle in front. There is usually an 18-wheeler in the right lane at the time. Dealer and manufacturer state that they aren't able to reproduce and that there are no malfunction codes. They insist that re-aligning sensors is a maintenance item and require payment of $150 to perform that function. The dealer also states they aren't sure that will fix the problem. Vehicle has had one defective icc sensor replaced and mis-aligned sensors realigned once.