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