Air Brake Practice Test Practice Test
Air Brake Test Emergency Procedures & Safety Protocols 2
When air pressure drops to approximately 20–45 psi in a vehicle with spring brakes, what happens?
Select your answer
A
The spring brakes automatically apply, bringing the vehicle to a stop
B
The service brakes become more powerful due to higher spring force
C
The low pressure warning light turns off
D
The driver must manually activate the emergency brake valve
Hint
