An original-equipment, 45-degree elbow on a line exiting a relay valve supplying a service chamber is replaced by a 90-degree elbow. Technician A says that this should have no effect on brake performance, because it is the service application pressure that determines braking force. Technician B says that the use of the 90-degree elbow increases flow restriction and can affect pneumatic timing. Who is correct?

A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B


B. Technician B only

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A ____________________ is a microprocessor designed to communicate with the vehicles computer.

Fill in the blank(s) with the appropriate word(s).

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What guidelines should you follow to improve the clarity of your line charts?

What will be an ideal response?

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Technician A says that the cooling system should be tested for leaks using an air-operated pressure pump. Technician B says the freezing and boiling point of the coolant can be tested using a thermometer. Which technician is correct?

A) Technician A only B) Technician B only C) Both technicians D) Neither technician

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What are the mechanisms of energy transfer to a closed system? How is heat transfer distinguished from the other forms of energy transfer?

What will be an ideal response?

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