Fits the Following Vehicles: 2008-2014 2015 Mitsubishi Lancer Descriptions: Anti-lock braking system (ABS) consists of valves, a controller, and a speed sensor, all of which work together to make sure that you can brake safely. The ABS speed sensor monitors the way in which the tires rotate and make sure that the ABS system is triggered if there is any difference or slippage between the wheels. If this sensor detects a difference, it sends a message to the controller telling it to engage the ABS and overrides your manual braking. ? What's the Content: 2 Pcs Sensor Q&A: 1.How to clean an ABS sensor? .