Which of the following accounts for slower modulation frequencies in truck pneumatic brake systems than equivalent hydraulic brake systems?
A) trucks move more slowly than automobiles
B) compressibility of air versus that of hydraulic fluid slows switching frequency
C) truck chassis computers function at slower clock speeds than automobile computers
D) truck ABS system have to manage many more brakes than automobile ABS

Question

Quizplus · Accepted Answer

The compressibility of air, which is used in pneumatic brake systems, versus the incompressibility of hydraulic fluid used in hydraulic brake systems, results in slower modulation frequencies for pneumatic systems. This is because air can be compressed, leading to a delay in the transmission of force through the system, whereas hydraulic fluid transmits force almost instantaneously due to its incompressibility.

Which of the Following Accounts for Slower Modulation Frequencies in Truck