Depends on the service brakes being in adjustment. ✓ CORRECT
Is not affected by the condition of the service brakes.
Can only be tested by highly-trained brake service people.
62
Your brakes are fading when:
You have to push harder on a brake pedal to control your speed on a downgrade. ✓ CORRECT
Less pressure is needed on the brake pedal for each stop.
The brake pedal feels spongy when you apply pressure.
63
If your vehicle has an alcohol evaporator, it is there to:
Eliminate the need for daily tank draining.
Boost tank pressure the same way that turbocharges boost engine.
Reduce the risk of icing in air brake valves in cold weather. ✓ CORRECT
64
The air compressor governor controls:
The speed of the air compressor.
Air pressure applied to the brakes.
When air is pumped into the air tanks. ✓ CORRECT
65
Modern air brake system combines three different systems. They are the service, the parking, and the ____ brakes.
Emergency ✓ CORRECT
Foot
Drum
66
If you do not have automatic tank drains, how often should you drain the oil and water from the bottom of compressed air storage tanks?
After every four hours of service.
At the end of each day of driving. ✓ CORRECT
Once a week.
67
The proper use of the brakes when going down a long steep grade after selecting a proper gear is to brake until your speed is about ____ mph below the posted speed for your safety and release your brake.
5 mph ✓ CORRECT
15 mph
10 mph
68
In ideal conditions, a truck or bus with an air brake going at 55 mph would require stopping distance of how many feet?
Less than 100 feet
More than 300 ft. ✓ CORRECT
From 100 to 300 feet.
69
When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?
Never ✓ CORRECT
If you are only away for a few minutes.
If you are conducting a pre-trip inspection
70
When is it OK to leave your truck unattended without applying the parking brakes and choking the wheels?