AIR BRAKES PRACTICE TEST - IOWA
16.
Spring brakes are usually held back by:
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modulating control valves.
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air pressure.
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the antilock braking system.
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17.
If the low air pressure warning light comes on, you should:
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continue to drive normally.
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call for help.
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stop immediately.
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18.
The safety relief valve is usually set to open at ____ psi.
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150
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50
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75
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19.
Banked curves:
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can be taken at any speed.
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should always be avoided.
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have a safe "design speed".
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20.
With a fully-charged air system, the leakage rates should be less than:
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3 psi for single vehicles and 4 psi for a combination of two vehicles.
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5 psi for single vehicles and 10 psi for a combination of two vehicles.
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2 psi for single vehicles and 3 psi for a combination of two vehicles.
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