Asked by Dameion Goodwin on Jul 20, 2024
Verified
If a truck brake system is functioning properly,when should the low air pressure warnings (buzzer and light) be illuminated
A) pressure drops below governor cut-out
B) pressure drops below governor cut-in
C) pressure drops to between 70-60 psi (4.8 - 4.1 bar)
D) pressure drops to tractor protection valve trip-out pressure
Governor Cut-out
Governor cut-out is a mechanism in compressors or engines designed to disengage or reduce fuel supply once a predetermined speed or pressure is reached, to prevent over-speeding.
Governor Cut-in
The point at which a governor device starts to regulate or limit the speed, pressure, or other operational parameters to prevent system overloads.
Tractor Protection Valve
A safety device in air-braked vehicles that preserves air for the tractor in case of a trailer brake system failure.
- Understand the operational principles of truck brake systems, including air pressure warnings and function of components like governors and unloaders.
Verified Answer
MU
Malik U?madJul 22, 2024
Final Answer :
C
Explanation :
The low air pressure warnings in a truck's brake system are designed to activate when the air pressure drops to a specific threshold, typically between 70-60 psi (4.8 - 4.1 bar), to alert the driver of potential brake system issues before the pressure drops to a dangerously low level.
Learning Objectives
- Understand the operational principles of truck brake systems, including air pressure warnings and function of components like governors and unloaders.