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WorksheetsWeek 7 Review Quiz
Total questions: 25
Worksheet time: 13mins
When discussing vehicle preparation; Technician A says park the vehicle on a level surface and chock the wheels with plastic wedges. Technician B says to use purpose-made pine blocking to support the axle when removing wheel ends. Who is correct?
Select one:
Tech A
Tech B
Both
Neither
All of the following are good safety practices to follow during brake system service, EXCEPT:
Select one:
a.Keep hands away from brake chambers and related parts.
b. Do not remove a component or pipe plug until all system air pressure has been depleted.
c. Use compressed air or dry brushing to clean brake parts or assemblies.
d.Wear a disposable face mask.
All of the following defects in the foundation brakes can result in soft braking, EXCEPT:
Select one:
a.Incorrect chamber size and type
b. Excessive tank (reservoir) pressure
c. Damaged, kinked, pinched, or undersized brake hoses and/or lines
d.Incorrect slack adjuster length
Which of the following is an unintended left or right direction change by a vehicle during a brake application?
Select one:
a.Torque balance
b.Brake pull
c.Brake balance
d.Brake timing imbalance
The causes of a grinding noise when the brakes are applied would include __________.
Select one:
a.Poor lining-to-drum contact
b.Glazed lining and/or drums
c.Foreign material embedded in friction material
c.Foreign material embedded in friction material
d.Imbalanced brakes
c.Foreign material embedded in friction material
d.Imbalanced brakes
Technician A says troubleshooting problems in a vehicle's braking system must be undertaken methodically. Technician B says the manufacturer's specific information should always be consulted for the vehicle you are working on. Who is correct?
Select one:
Tech A
Tech B
Both
Neither
What is the upper limit of an acceptable level of air leakage for a tractor with two trailers?
Select one:
a.4 psi
b.6 psi
c.8 psi
d.10 psi
Which of the following is responsible for removing oil passed into the air supply by the compressor?
Select one:
a.Exhaust port
b.Service chamber
c.Air dryer
d.Air reservoir
Technician A says inspecting the operation of the automatic emergency brake system helps determine whether the spring brakes will apply during a loss of system pressure. Technician B says the inspection also helps identify whether several controlled applications of the brake pedal can be used to help slow a vehicle with a sudden severe drop in air pressure. Who is correct?
Select one:
Tech A
Tech B
Both
Neither
Unbalanced brake pressures can be caused by __________.
Select one:
a.Glazed friction material
b.Malfunctioning relay valves
c.Polished drums or rotors
d.Improperly installed automatic slacks
While recommending repairs to a truck with oil contaminated brake lining caused by a leaking wheel seal, Technician A says the lining should be replaced, not just cleaned, on the contaminated wheel end. Technician B says that the brake lining should be replaced on both sides of the same axle with the contaminated lining. Who is correct?
Select one:
Tech A
Tech B
Both
Neither
Consider a bus with air brakes operating at 5280 ft (1609 m) altitude. What effect does the lower atmospheric pressure have on the brake system operation?
Select one:
a.Maximum air tank pressure is lower.
b.Brake application force is lowered.
c.There is no change on air system pressure or application force.
d.The transmission speed of air through brake lines is reduced.
Which of the following best describes how brakes transform energy?
Select one:
a.Brakes convert rotational tire movement into friction.
b.Brakes convert kinetic energy produced by the engine into heat.
c.Brakes convert tire rotational energy into heat.
d.Brakes convert vehicle kinetic energy into heat.
How can you test the low pressure warning signal
While the engine is running, step off and on the brake pedal
Shut off the engine and see fi the air pressure leaks down
Shut off the engine with enough air pressure, turn of the electrical power and step on and off the brake pedal until the low air pressure warning signal comes on.
-
The air brake system for a straight truck or bus should not leak at a rate of more than _______psi per minute with the engine off and the brakes released.
3
1
2
-
To test the air leakage rate you should:
Turn off the engine and release the parking brake
charge the air system and leave the engine running
leave the engine running and release the parking brake
-
Which of these is the most important thing to remembner about emergency braking.
Never do it without downshifting first
If the wheels are skidding, you cannot control the vehicle
Disconnecting the steering axle brakes will help keep vehicle in a straight line during emergency breaking.
-
The service brake applies and releases
The parking brake when you use the parking brake control
In the event of an emergency
The brake when you use the brake pedal during normal driving
The clutch in the manual transmission while operating the heavy duty trucks
What is NOT a major type of brake systems?
Hybrid Brakes
Truck Brakes
Brake Line
Brake Line
Which of the following statements is correct?
a. A left-hand S-cam cam shaft is located on the driver's side of the vehicle and turns clockwise to apply brakes.
b. A left-hand S-cam cam shaft is located on the driver's side of the vehicle and turns counterclockwise to apply brakes.
c. A right-hand S-cam shaft is located on the driver's side of the vehicle and turns counterclockwise to apply brakes.
d. A right-hand S-cam shaft is located on the driver's side of the vehicle and turns clockwise to release brakes.
What is the effect on the brake application force if an automatic slack adjuster with a longer arm is installed?
Select one:
a. Application force increases, and brake chamber stroke length remains the same
b. Application force decreases, but brake stroke length increases
c. Application force increases, but brake stroke length decreases
d. Application force increases, and brake stroke length increases
S-Cam Brake shoe Removal and Installation: The slack adjuster should be backed off until the .
Select one: (a)
S-Cam Brake shoe Removal and Installation: The purpose of the retaining spring is to .
Select one: (a)
