NHTSA Recall Official Site:  http://www-odi.nhtsa.dot.gov/

NHTSA wrote:

Make : NISSAN      Model : SENTRA      Year : 2007
Manufacturer : NISSAN NORTH AMERICA, INC.     Mfr's Report Date : JUL 02, 2008
NHTSA CAMPAIGN ID Number : 08V311000    
N/A
NHTSA Action Number: N/A
Component: SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:MASTER CYLINDER
Potential Number Of Units Affected : 169202
Summary:
NISSAN IS RECALLING 169,202 MY 2007-2008 SENTRA PASSENGER VEHICLES EQUIPPED ROBERT BOSCH MASTER CYLINDER. DUE TO THE MACHINING IRREGULARITY BY THE SUPPLIER, THE INTERNAL SEAL GROOVE IN THE BODY OF SOME BRAKE MASTER CYLINDERS MAY ALLOW FOR A GAP IN THE GROOVE CONTACT AREA OF THE SEAL. THIS MAY RESULT IN BRAKE FLUID SLOWLY LEAKING FROM THE MASTER CYLINDER INTO THE BRAKE BOOSTER ASSEMBLY, CAUSING THE BRAKE WARNING LIGHT TO ILLUMINATE.
Consequence:
IF THE WARNING LAMP IS IGNORED, ONE OF THE BRAKE CIRCUITS ON THE VEHICLE MAY NOT OPERATE AS DESIGNED INCREASING THE RISK OF A CRASH.
Remedy:
DEALERS WILL INSPECT THE MASTER CYLINDER/BRAKE BOOSTER ASSEMBLY AND IF BRAKE FLUID LEAKAGE IS DETECTED, THE MASTER CYLINDER WILL BE REPLACED WITH A NEW ONE FREE OF CHARGE. THE RECALL IS EXPECTED TO BEGIN ON JULY 23, 2008. OWNERS MAY CONTACT NISSAN AT 1-800-647-7261.
Notes:
CUSTOMERS MAY ALSO CONTACT THE NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION'S VEHICLE SAFETY HOTLINE AT 1-888-327-4236 (TTY 1-800-424-9153), OR GO TO HTTP://WWW.SAFERCAR.GOV.