Spoon Sports 11/14/2011BAS stands for Brake Assist and what it does is detect a panic stop situation and it holds full braking pressure on the brakes until the pedal is released. The reason for this is that multiple studies have shown that many people don't brake hard enough in a panic situation which increases braking distance. Brake Assist helps overcome this and will hopefully either avoid a collision entirely or at least lessen the severity of the impact.
If the BAS lamp has come on, you'll have to have the vehicle scanned to find out why it has come on. a common problem for a BAS warning is a faulty brake lamp switch or a wheel speed sensor.
Why dont you post your email so i can send you more info.
collier2000 11/15/2011Brake Lamp Switch, 15$ from internet. Fairly easy to change out. Remove screws from drivers side lower instrument panel, disconnect switch, turn switch to unlock, remove. Replace with new switch.