A forward facing aerodynamic device or opening used to duct cool outside air to some part of the vehicle such as the carburetor intake, the brakes, the radiator, or an oil cooler. ABS (Anti-Lock Brake System) A device which senses that one or more of the wheels are locking up during braking. It is controlled by both mechanical and electronic components. When you apply the brakes, the ABS will regulate the flow of brake fluid being delivered to the brake calipers. It must be remembered that a wheel cannot be steered unless it is rolling; so if the wheel is locked up, there is no steering control. By the use of electronic computers, the brakes rapidly alternate (at a rate of 30 times per second) from full pressure to full release. This process will also alternate from the left-front wheel and the right-rear wheel and switch to the right-front wheel and left-rear wheel. In this way both maximum braking and maximum steering control is allowed during braking.