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📖 Air Brakes Test
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51
Emergency stab braking is:
When you press hard on a brake pedal and apply hand valve while you stop.
Use lightly steady pressure on the brake pedal.
Press on the brake pedal as hard as you can, release the brakes when the wheels locked, put on the brakes again when the wheels start rolling. ✓ CORRECT
52
A slack adjuster’s free play needs to be adjusted if it is more than about ____ how many inches when you pull hard on it?
1/4 inch
1/2 inch
1 inch ✓ CORRECT
53
If air pressure is not built up within the correct amount of time, then:
You should be ready to use your parking brakes to stop.
The alcohol container may be low.
Your air pressure may drop to a low point while driving, requiring an emergency stop. ✓ CORRECT
54
The safety valve reduces pressure at ___ psi?
50
100
150 ✓ CORRECT
55
Why should you drain water from compressed air tanks?
Water low boiling point reduces braking power.
Water can freeze in cold water and cause brake failure. ✓ CORRECT
Water cools the compressor too much.
56
When brakes are applied the brake shoes will align to press against the:
Brake drum or disc. ✓ CORRECT
Slack adjuster
S-cam
57
Why should you drain water from compressed air tanks?
Water low boiling point reduces braking power.
Water can freeze in cold weather and cause brake failure. ✓ CORRECT
To keep heat from air compressor oil.
58
If you must make an emergency stop, you should brake so you:
Use the hand brake before the brake pedal
Can steer and so your vehicle stays in a straight line. ✓ CORRECT
Use the full power of the brakes to lock them.
59
The supply pressure gauge shows how much pressure:
Is in the air tanks. ✓ CORRECT
You have used on this trip.
Is going to the brake chamber.
60
The supply pressure gauge shows how much pressure:
Is in the air tanks. ✓ CORRECT
You have used on this trip.
Is going to the brake chamber.