If a post-2010 truck air system is functioning to the FMVSS 121 standard, what should be the maximum time required to build system pressure from 85 psi to 100 psi (5.8 to 7 bar)?
A. 25 seconds
B. 40 seconds
C. 60 seconds
D. 90 seconds
Answer: A
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a. No pressure drop is encountered b. The pressure stays the same c. The pressure drop decreases d. The pressure drop increases
In a hydraulic drum brake system, what force pulls the shoes away from the drum when the brakes are released?
A. Hydraulic force at the master cylinder B. Retraction spring force at the brake shoe assembly C. Hydraulic force at the wheel cylinder D. Brake pedal spring force
The purpose of the schematic diagram is:
A) To show how the power and control wiring connect to the unit. B) To show the location of all the electrical components. C) To show how and where all the wires inside the unit are connected. D) To show the scheme, or logic, of the electrical circuitry.
If a driver is crossing raised railroad tracks and the rig gets caught on the tracks, the first thing that the driver should do is
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