Exam (elaborations)
Chapter #28 - Review Questions with Answers (Heavy Duty Truck Systems 5th edition)
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Chapter #28 - Review Questions with Answers (Heavy Duty Truck Systems 5th edition)
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Chapter #28 - Review Questionswith Answers (Heavy Duty Truck
Systems 5th edition)
The brake shoes,retraction, and fastening hardware are mounted to: - - a
spider
- Technician A says that air disc brakes usually produce higher mechanical
braking efficiencies than equivalent S-cam brakes. Technician B says that the
reason wedge brakes produce higher mechanical braking efficiencies than
equivalent S-cam brakes is that they are usually double actuated. Who is
correct? - - A & B
- What is the function of a system safety pop-off valve? - - it relieves
pressure from the supply tank in the event of governor cut out failure
- An air brake equipped truck is traveling on a highway at 60 mph and the
driver makes a service brake application. Which of the following should be
true in all of the spring brake chambers on the vehicle? - - both the service
and hold-off chambers are charged with air
- What actuates the relay piston in a foot valve on a air brake system when
the valve is operating normally? - - air pressure
- In the event of a total failure on the primary circuit in an FMVSS121
complaint vehicle, how is the relay/secondary circuit actuated in the foot
valve? - - mechanically
- What is the usual color of the tractor to trailer service hose? - - blue
- Which of the following best describes the term coefficient of friction? - -
the aggressiveness of a friction material
- Which of the following determines the amount of leverage gained by a
slack adjuster? - - the slack adjuster lenght
- When an inversion valve becomes functional during a brake failure, what
force is used to brake the vehicle? - - spring pressure
- The potential energy of an air brake system is: - - compressed air
- Which of the following air brake system components functions as a lever? -
- the slack adjuster
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