Brake Presure Switch, Transducer, Located On Brake Master Cylinder. See #3 In Illustration. FITS 2003-2008 S-Type From VIN M45255 & 2004-2009 XJ8 XJR & 2003-2006 XK8 XKR From VIN A30645. **Some Applications Use Qty 1, Others Use Qty 2. Please Refer To Epc Cataloging!** (XR828106)