<Li> The ABS controller knows that such a rapid deceleration is impossible, so it reduces the pressure to that brake until it sees an acceleration, then it increases the pressure until it sees the deceleration again . It can do this very quickly, before the tire can actually significantly change speed . The result is that the tire slows down at the same rate as the car, with the brakes keeping the tires very near the point at which they will start to lock up . This gives the system maximum braking power . </Li> <Li> This replaces the need to manually pump the brakes while driving on a slippery or a low traction surface, allowing to steer even in most emergency braking conditions . </Li> <Li> When the ABS is in operation the driver will feel a pulsing in the brake pedal; this comes from the rapid opening and closing of the valves . This pulsing also tells the driver that the ABS has been triggered . Some ABS systems can cycle up to 16 times per second . </Li> <P> Anti-lock braking systems use different schemes depending on the type of brakes in use . They can be differentiated by the number of channels: that is, how many valves that are individually controlled--and the number of speed sensors . </P>

Where is the anti lock braking system located