At 4100 miles our ZDX started showing the Service Brake Assist system warning, the auto-hold unavailable warning, and the one pedal driving unavailable warning. Took the vehicle to the dealership. Got the car back in 15 days and the problem persists. Dealership says no code was stored, yet the vehicle constantly clicks when the brake pedal is depressed. It also has a jerking sensation when coming to a stop. I’m concerned that there is a braking issue, so I avoid having my family use this vehicle.