Commercial Vehicle Maintenance Course

This is a prototype course for the purpose of creating and extracting xAPI statements to an LRS.  The statements will be used to calculate a student's learning objective performance value.  

(E) Without the aid of reference, recall the major components of a vehicle’s air brake system and their purpose.

Air Brake System Module

The major components of a vehicle’s air brake system are the compressor, main reservoir, auxiliary reservoir, air dryer, brake pedal, brake pipe, drain valves, and hand brake.

The purpose of the compressor is to pump air into the reservoirs to be used in the operation of the air brake system.

The purpose of the main reservoir is to store pressurized air to be used in the operation of the air brake system.

Which of the following is NOT a major component of vehicle’s air brake system?

  • brake pedal
  • main reservoir
  • hydraulic brake lines
  • air dryer

Which of the following describes the purpose of the compressor?

  • pump air into the reservoirs
  • open the vehicle doors
  • carry the electrical current from the ignition to the starter
  • carry the brake fluid from the master cylinder to the brake caliper assembly

(B) Without the aid of reference, recall the major components of a vehicle electrical system and their purpose.

Electrical System Module

The major components of a vehicle electrical system are the engine control unit, alternator, battery, starter solenoid, starter, fuse box, ignition switch, and the starter relay.

The purpose of the alternator is to recharge the battery of the power it uses while the vehicle is running.

The purpose of the ignition switch is to activate the electrical power of a vehicle.

The purpose of the battery is to provide the electrical current needed to start the vehicle.

The purpose the starter solenoid is to convert electrical current to mechanical motion to enable the starter motor to start the vehicle.

Which of the following is NOT a major component of a commercial vehicle’s electrical system?

  • starter
  • starter relay
  • solenoid
  • main reservoir

Which of the following describes the purpose of the battery?

  • inflate the tires
  • adjust the vehicle seats
  • carry hydraulic fluid from the hydraulic reservoir to the brake caliper
  • provide the electrical current needed to start the vehicle

(C) Without the aid of reference, recall the major components of a vehicle’s steering system and their purpose.

Steering System Module

The major components of a vehicle steering system are the steering wheel, steering column, power steering pump, powering steering fluid reservoir, tie rods, rack and pinon unit, and tires.

The purpose of the steering column is to connect the steering wheel to the rack and pinon unit to transfer the driver inputs to the remaining steering assembly.

The purpose of the tie rods is to connect the steering assembly to the wheels and ensure the wheels maintain alignment.

The purpose of the power steering pump is to provide the hydraulic fluid pressure needed to operate the power steering system.

The purpose the power steering fluid reservoir is to store hydraulic fluid needed to operate the power steering system.

Which of the following is NOT a major component of a commercial vehicle’s steering system?

  • tie rods
  • drain valves
  • rack and pinon unit
  • steer fluid reservoir

Which of the following describes the purpose of the power steering pump?

  • provide the hydraulic fluid pressure needed to operate the power steering system
  • transfer driver inputs to remaining steering assembly
  • cool the engine down
  • carry the electrical current from the ignition to the starter

(F) Without the aid of reference, recall the major components of a diesel engine and their purpose.

Diesel Engine Module

The major components of a diesel engine are the crankshaft, camshaft, timing belt, fuel injector, intake manifold, exhaust manifold, cylinder head cover, pistons, engine block, and oil pan.

The purpose of the piston is to transfer the energy caused by the explosion of the fuel/air mixture within the combustion chamber to the crankshaft.

The purpose of the camshaft is to convert its rotational motion to a up and down motion through the push rods and rocker arms to open valves into the combustion chambers.

Which of the following is NOT a major component of a diesel engine?

  • a) engine block
  • b) distributor
  • c) spark plug
  • d) fuel injector

Which of the following describes the purpose of the piston?

  • transfer the energy caused by the explosion of the fuel/air mixture within the combustion chamber to the crankshaft
  • increase the speed of the vehicle
  • convert the up and down motion of the pistons into rotational motion
  • cool the engine down