61. The braking power of the spring brakes:
Depends on the service brakes being in adjustment.
62. Your brakes are fading when:
You have to push harder on a brake pedal to control your speed on a downgrade.
63. If your vehicle has an alcohol evaporator, it is there to:
Reduce the risk of icing in air brake valves in cold weather.
64. The air compressor governor controls:
When air is pumped into the air tanks.
65. Modern air brake system combines three different systems. They are the service, the parking, and the ____ brakes.
Emergency