Braking precautions
The brake system has two separate hydraulic circuits. If one circuit malfunctions, you will still have braking at two wheels.
You may feel a small click and hear a sound when the brake pedal is fully depressed slowly.
This is not a malfunction and indicates that the brake assist mechanism is operating properly.
See also:
Warning/indicator lights and audible reminders
...
Air conditioner operation
The air conditioner system should be operated
for approximately 10 minutes at least once a
month. This helps prevent damage to the air
conditioner system due to the lack of lubrication.
Cooling ...
New for 2010
The Frontier receives only minor changes for 2010, centered around safety
improvements and greater availability of driveline features. ...