Release Switch: Description
WARNING: This page is about a different car, the 2006 Chrysler Crossfire. However, it is still accessible from the selected car via links, so may be relevant.
The BAS release switch (2) is a device used to signal the Controller Antilock Brake (CAB) module that the brake is released.
The BAS release switch (2) cannot be serviced. The power brake booster must be replaced in the event of a BAS release switch failure.