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:

Brake system
The brake system has two separate hydraulic circuits. If one circuit malfunctions, you will still have braking at 2 wheels. ...

Safety
At this time, the Sentra has not been crash tested by the Insurance Institute for Highway Safety. Standard safety features include antilock brakes with electronic brake-force distribution, active ...

Opener operation
WARNING: - Do not drive with the trunk lid open. This could allow dangerous exhaust gases to be drawn into the vehicle. See Exhaust gas in the Starting and driving section of this manual. ...