All vehicles with air brakes must have a low air pressure warning signal. True or False? - TRUE
Coffee and a little fresh air will help a drinker sober up. True or false? - False.
Common medicines for colds can make you sleepy. True or False. - True.
Describe the proper braking technique when go...
Texas CDL Class B Quiz Questions
All vehicles with air brakes must have a low air pressure warning signal. True or False? - TRUE
Coffee and a little fresh air will help a drinker sober up. True or false? - False.
Common medicines for colds can make you sleepy. True or False. - True.
Describe the proper braking technique when going down a long, steep downgrade. - Apply brakes
just hard enough to feel a definite slowdown. When your speed has been reduced approx. 5 MPH below
your "safe" speed, release the brakes. When your speed has increased to your "safe" speed, repeat first
2 steps.
Empty trucks have the best braking. True or false? - FALSE. The brakes, tires, springs, and shock
absorbers on heavy vehicles are designed to work best when the vehicle is fully loaded. Empty trucks
require greater stopping distances because an empty vehicle has less traction.
For other tires? - 2/32 inch
Front wheel brakes are good for under all conditions. True or False? - TRUE
How can you check slack adjusters? - Use gloves and pull hard on the slack adjuster, if the slack
adjuster moves more than an inch, it needs adjusting.
How can you check that the spring brakes come on automatically? - Continue to fan off the air
pressure by stepping on and off the brake pedal to reduce tank pressure. The tractor protection valve
and parking brake valve should close (pop out) on a tractor-trailer combination and single vehicle types
when the air pressure falls to the manufacturer's specification (20-40 psi). This will cause the spring
brakes to come on.
How can you test the low pressure warning signal? - Shut the engine off when you have enough
air pressure so that the low pressure warning signal is not on. Turn the electrical power on and step on
, and off the brake pedal to reduce air tank pressure. The low air pressure warning signal must come on
before the pressure drops to less than 60 psi in the tank (or tank with the lowest air pressure, in dual air
systems).
How do antilock brakes help you? - Help you avoid wheel lock up and maintain control.
How do you brake when you drive a tractor-trailer combination with ABS? - Use only the braking
force necessary to stop safely and stay in control.
How do you check for leaks in hoses? - Look for puddles on the ground, or dripping fluids on the
underside of the engine/transmission or inspect hoses for condition and leaks.
How do you check hydraulic brakes. - Pump the brake pedal 3 times, then hold it down for 5
seconds. The brake pedal should not move during the 5 seconds. Check that the warning buzzer or lights
are off.
If equipped with a hydraulic brake reserve system, with the key off, depress the brake pedal and listen for
the sound of the reserve system electric motor.
How do you check oil level? - See that oil level is within safe operating range, Level must be above
refill mark.
How do you find out how many seconds of following distance space you have? - 1 second for
every 10 feet of vehicle length under 40 mph, over 40 mph add a second per 10 feet
How do you know if your vehicle has antilock brakes? - They will have yellow malfunction lamps
on the instrument panels and yellow malfunction lamps on the trailers. Dollies after 1998 are required to
have a lamp on the left side
How do you know if your vehicle is equipped with antilock brakes? - If the vehicle was
manufactured on or after March 1, 1998.
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