Question If an Anti-Lock Braking System (ABS) malfunctions: Answers The driver will not know. A yellow lamp will light up on the control panel. The brakes will lock up. The brakes will not work. Explanation On a vehicle with ABS, a yellow malfunction lamp on the instrument panel will illuminate to alert you if the braking system is not working. Take a FREE Practice Test Now This questions appears in the following tests: District Of Columbia Knowledge Test Class A , Georgia Knowledge Test Class A , Kansas Knowledge Test Class B , Pennsylvania Knowledge Test Class B ,