a) For pre trip inspection purposes
b) To check for leaks
c) To release oil and water buildup
d) To activate the low air pressure alarm
a) To check tire pressure
b) To check tank pressure
c) To activate the low pressure alarm
d) To check for leaks
a) Hydraulic brakes
b) Air brakes
c) Emergency/parking brake
d) Trailer brakes
a. You have to push harder on the brake pedal to control your down hill speed
b. The brake pedal feels spongy when you apply pressure
c. Pressure on the brake pedal is released and speed increases
a. Only when driving down hill
b. Only on a slippery road
a. A loss of air pressure
b. A build up of air pressure
c. No change in brake air pressure
a. To balance the service brake system when you are parked
b. To stay parked twice as long without using up service air pressure
c. To release the emergency/spring/parking brakes to move a short distance
a. Controls the speed of the air compressor
b. Controls the air pressure applied to put on the brakes
c. Is connected to slack adjusters by a series of rods and linkages
a. Park on level ground and apply the parking brakes
b. Park on a slight grade, release the parking brakes
c. Park on level ground, chock the wheels, release the parking brakes and pull on the slack adjusters
a. Press hard on the brake pedal and apply full pressure on the hand valve until you stop
b. Use light steady pressure on the brake pedal
c. Brake as hard as you can, then release the brakes when the wheels lock up and put on the brakes again when the wheels start rolling
a. Wedge drum
b. Disc Brake
a. The manual slack adjusters on S-Cam brakes are not set properly
b. The brake drums will not be fully operational
c. Either the front or rear brakes will not be fully functional
a. Up shift
b. Down shift
c. Stop and safely park as soon as possible
a. As little as possible
b. Any time the vehicle is parked
c. To hold your speed when going down hill
a. When air is pumped into the tanks
b. The speed of the air compressor
c. Air pressure applied to the brakes
a. Turns on the brake light to warn other drivers behind you
b. Tells you when you need to use your emergency brakes
c. Tells you when the air brake system is low on air pressure
a. 1 PSI in one minute
b. 2 PSI in 45 seconds
c. 3 PSI in one minute
a. Depends on the service brakes being in adjustment
b. Is not affected by the condition of the service brakes
c. Can only be tested by highly trained brake service personnel
a. Park on a slight incline drain off air pressure, set parking brakes and check for movement
b. Park on level ground, chock wheels, release parking brake when you have enough pressure shut the engine off and repeatedly press and release the pedal
c. Park on level ground wait for normal air pressure, release the parking brake, move the truck forward slowly and apply the brakes firmly using the brake pedal
a. Park on a slight grade, drain off air pressure set parking brake, check movement
b. Park on level ground, chock wheels, engage parking brake when you have the correct amount of air pressure shut off the engine
c. Park on level ground wait for normal air pressure, release the parking brake move forward slowly and apply the brakes firmly using the brake pedal
a. Applying the brakes as hard as you can without locking up the brakes
b. Brake as hard as you can release the brakes when the wheels lock up and put the brakes back on again when the wheels start rolling
c. Apply the hand valve for one second then push hard on the brake pedal
a. If the brakes are very hot (eg. Just after coming down a steep grade)
b. If you will be stopping for only one hour
c. If your going to test the parking brake to make sure that it holds the vehicle
a. A supply air pressure gauge
b. A air use gauge
c. A backup hydraulic system
a. You should be ready to use your parking brake to help stop
b. The alcohol evaporator container may be low
c. Your air pressure may drop too low during driving requiring an emergency stop
a. Improper adjustment of the S-Cam
b. Increased contact between brake drums and brake linings
c. Expansion of the brake drums
a. Turn off the engine
b. Let the air out of the air brake system
c. Be sure that the air brake system is fully pressurized
a. Brake lag
c. Effective braking
a. Can use the hand brake before the brake pedal
b. Can steer and your vehicle stays in a straight line
c. Can use the full power of the brakes to lock them up
a. Spring pressure
b. Air pressure
c. Hydraulic pressure
a. The S-Cam may not rotate back when you release the brake pedal
b. Ice may form in the air storage tanks or air lines and cause brakes to fail
c. Ice may form on the brake drums and warp them
a. Reduce your speed and drive to the nearest dot certified garage for repairs
b. Reduce your speed and test the remaining system while under way
c. Stop right away and safely park the truck, continue only after the system is fixed
a. They contract
b. They start to smoke
c. They expand
a. When ever the brakes feel spongy
b. Once a week
a. How much air pressure is in your tanks
b. How much air pressure you are applying to the brakes
c. How much air pressure is escaping through your brake chamber
a. Controlled braking is only used on wet roads
b. Controlled braking is for combination vehicles stab braking is for single vehicles
c. Controlled braking does not lock the wheels stab braking involves locking the wheels
a. Pull the valves out
b. Push the valves in
c. Leave the valves in the normal position
a. 45 seconds
b. 1 minute
c. 2 minutes
a. Brake screw
b. Power screw
c. Air pressure Screw
a. 130 PSI
b. 150 PSI
c. 160 PSI
a) 2 systems which use a single set of brake controls
b) 2 brake controls that operate from a single system
c) A system that uses 2 brake controls
d) A single brake that operates 2 systems
a) Adjusts the pressure in the tank
b) Adjusts the spring brakes
c) Adjusts the slack in the brake pedal
d) Adjusts the slack in the brakes
a) Apply parking brake and pump the brake pedal again and again
b) Push in on the adjuster
c) Release the parking brake, pull hard on the adjuster
d) Slam on the brakes traveling 20 mph or over
a) Release parking brake and press the brake pedal again and again
b) Apply parking brake and press brake pedal again and again
c) Slam on the brakes while traveling 20 mph or more
d) Apply and release parking brake again and again
a) More than 2 psi in one minute
b) More than 2 psi in two minutes
c) More than 3 psi in one minute
d) More than 3psi in two minutes
a) The use of brakes is only a supplement to the braking effect of the engine
b) So the brakes will not get too hot and start to catch fire
c) To save wear and tear on the transmission
d) So you will not pick up too much speed
a) Driving in a heavy rain
b) Excessive use of service brakes
c) Driving in heavy traffic
d) Excessive use of emergency brake
~of the engine. True or False?
a) Does not allow brakes to cool
b) The brake linings do not get hot when fanning
c) There is less air usage when fanning
d) None of these
with engine off and brakes “released”.
with engine off and brakes “released”.
b) Centrifugal force
c) Spring pressure
d) Air pressure
a) Only during pre-trip and post-trip inspections
b) Every time you park the vehicle
c) As little as possible
d) When slowing down
a) The one’-way check valve
b) The emergency relay valve
c) The tractor protection valve
d) The governor
d) All of these
a) The driver (by hand)
b) Air pressure
c) Hydraulic pressure
d) Spring pressure
do everyday during winter weather?
a) Drain the accumulated alcohol
b) Use 5 weight oil to oil the system
c) Change the alcohol from a new bottle
d) Check and fill the alcohol level
a) Hand brake system
b) Drum brake system
c) Emergency brake system
d) Parking brake system
a) Exerts force on the slack adjusters by rods and connectors
b) Controls the air pressure to operate the brakes
c) Can be used as a foot rest
d) Is the systems main lever
a) 3 psi in one minute
b) 2 psi in 45 seconds
c) I psi in one minute
d) I psi in 30 seconds
Parking brakes and:
a) Drum brakes
b) S-cam brakes
c) Foot brakes
d) Emergency brakes
a) To prevent skids and slides
b) `Applies extra braking power to non-drive aXles
c) Helps slow the vehicle and reduce brake wear
d) Provides emergency brakes
when the push rod attaches.
seconds in a dual air system.
when the wheels lock up.
problem with the service brakes.
a. perception distance.
b. reaction distance.
c. brake lag.
a. 20 to 45 psi.
b. 120 psi.
c. 150 psi.
a. those brakes will develop more heat.
b. vehicle handling will be effected.
c. all the above.
a. the system is working properly.
b. your pressure is probably low.
c. the system needs immediate attenb~on.
charge the air the system. Your gauges should show your_ .
a. pressure builds from 85 to 100 psi with-in three minutes.
b. your pressure builds from 85 to 100 psi with-in 45 seconds.
c. the compressor cuts out by 75 psi.
a. air pressure.
b. electrical current.
c. a means other than air, electrical or hydraulic.
a. are part of the parking brake systems operation only.
b. are part of the service brake system only.
c. are part of both the parking and emergency brakes.
a. low hydraulic fluid.
b. brakes being out of adjustment.
c. a broken air line.
a. Spring brake system.
b. Service brake system.
c. Parg brake system.
a. A mechanical arm that signals low air pressure.
b. A spring mount for hair pieces.
c. Part of the stop light system.
a. Older vehicles made before 1975.
b. New ‘Import vehicles only.
c. School buses.
A. At normal pressure
B. Bled down to half the maximum pressure
C. Between 60-80 psi