Legally - at all times the vehicle is used on public roads.
Practically - when you want to park on an incline.
Yes, but know that your parking brake on applies your rear brakes. For this reason it is very easy to cause your vehicle to slide sideways when applying only the rear brakes. Also the fact that your parking brake will lock due to the indents, you must use it wisely in an emergency. It also will take quite a long distance to stop any vehicle with the parking brake only.
Yes, a parking brake system is required regardless of the functionality of the service brakes. The parking brake acts as an additional safety measure to secure the vehicle and prevent unintended movement when it is parked. It is a separate system from the service brakes and must be functional and in good working condition.
You should use your emergence/parking brakes as a backup to your regular brakes.
Quick Service brakes and parking brakes.
Parking brakes apply generally on rear wheels to control enough sliding of the vehicle.
you sit on them
Only on air brake vehicles.
If the parking brake does not engage fully, the rear (shoe type) brakes need to be adjusted or replaced.
The handbrake is only used for parking.
No. Usually the parking brake is a separate mechanism from the driving brakes, and its usually only found on the rear wheels.
The parking light stays on how am I sure the parking brakes are not on
a hairdryer!