OKLAHOMA CDL AIR BRAKES PRACTICE TEST
11.
How should you apply the brakes when going down a steep downgrade?
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Apply the brakes whenever you reach your safe speed, until your speed has been reduced to 5 mph below your safe speed.
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Apply the brakes when you reach the bottom of the downgrade.
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Apply the brakes as hard as you can without locking the wheels.
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12.
Supply pressure gauges tell you:
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how much air pressure you are applying to the brakes.
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how much pressure is in the air tanks.
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when the air pressure in the tanks falls below 60 psi.
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13.
Your truck has a dual air system. If either system is very low on pressure:
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either the front or the rear brake will not be fully operational.
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the tractor protection valve will not work properly.
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the low pressure warning signal will stop working.
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14.
Before driving a vehicle with a dual brake brake system, the driver should:
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wait at least 10 minutes before driving.
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allow time for the air compressor to build up a minimum of 100 psi pressure in both the primary and secondary systems.
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pump the brake pedal 10 times to build pressure.
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15.
How can you tell if your vehicle is equipped with ABS (anti-lock braking system)?
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There is no way to tell, ABS is still optional on all vehicle types.
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ABS is required on all vehicles manufactured on or after 2000.
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Trucks, buses, trailers, and converter dollies built after 1998 are required to have ABS.
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