I am assuming that you are talking about the RED brake warning lamp and not a YELLOW Anti-lock Brake Warning lamp. If this is not correct, please let me know. There are several things that can cause this. The parking brake my not be released properly. The switch for the parking brake may be defective. Your brake fluid level could be low. (If it is, it is EXTREMELY IMPORTANT that you find out WHY!) Or you could have a brake system hydraulic failure.
In any case, it is NOT SAFE to drive the vehicle until the CAUSE has been determined. It may be safe to operate the vehicle temporarily if you find it is being caused by a defective parking brake switch, but any of the other possible causes make the vehicle DANGEROUS to drive.
Whenever
this warning light or any other stays on in the dash it is indicating
that the systems control module (or the system sensor in the case of
lights like low oil pressure, door open indicators etc.) has detected
a fault, it then disables the system (this applies to ABS,TCS, TCM,
SRS and BCM faults and others) as long as the light is on. You must
now have the dealer hook up a special electronic diagnostic tool and
"scan" the system for the fault code that is stored for the
problem(s)
Legend of Abbreviations. ABS Antilock brake system.TCS Traction control system, TCM Transmission control module, SRS Supplemental restraint system, BCM Body control module
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