46. The most important thing to do when a low air pressure warning comes on is:
Stop and safely park as soon as possible.
47. The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away, like:
Spring Pressure
48. Air braking takes more time than hydraulic braking because air:
Takes more time to flow through the lines than hydraulic fluid.
49. When brakes are applied the brake shoes will press against the:
Brake drum or disc
50. The safety valve discharges automatically at the pressure of:
150