As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRIOR TO TAKEOFF FOR FLIGHT 3868 THE CREW DETERMINED THAT THE EMERGENCY PARKING BRAKE WOULD NOT ENGAGE. THE AIRCRAFT WAS REMOVED FROM SERVICE. CLEANED THE CABLE IN THE MECHANISM NOSE COMPARTMENT, LUBED THE PARKING BRAKE HANDLE IAW EMB 145 AMM 32-44-10. THE OPERATIONAL CHECK WAS GOOD, NO PARTS REMOVED OR REPLACED. THE AIRCRAFT WAS RETURNED TO SERVICE.