In a newer vehicle, you apply the parking brake:

Question

In a newer vehicle with air brakes, the parking brake is controlled by a diamond-shaped yellow knob. The knob is pulled out to apply the parking brakes and pushed in to release them.

Accepted Answer

By using a diamond-shaped yellow knob.

Answer

By using a round red knob.

Answer

By using a square green knob.

Answer

By using a black round knob.