Air Brakes #3 Flashcards
What is a push-plate in brake systems?
A component that is involved in the brake application process
It works in conjunction with the actuator to apply the brakes.
What is the function of the power spring in brake chambers?
To apply or release the brakes depending on air pressure
It is critical for the operation of spring brakes.
What is the difference between service chambers and spring brake chambers?
Service chambers require air pressure to apply brakes; spring brake chambers require air pressure to release brakes
This indicates their opposite operation mechanisms.
What is a dual-brake chamber?
A brake chamber that contains both a spring brake actuator and a service brake actuator in a single housing
It can function under normal and emergency conditions.
What is the purpose of long stroke chambers?
To minimize the hazard of inadequate brake stroke due to misadjusted slack adjusters or worn brakes
They are designed with special features to identify them.
What happens when air is exhausted from the rear chamber of a dual-brake chamber?
The power spring forces the actuator pushrod forward to apply the brakes
This occurs when park brakes are applied.
What pressure is needed to release the spring brake in a type 30 chamber?
Approximately 75 psi (517 kPa)
This pressure is necessary to compress the spring and release the brakes.
What is the potential consequence of a diaphragm diameter of 31.75 mm?
It causes the chamber’s effectiveness to drop and increases the potential for ‘bottoming out’
This affects the pushrod travel and brake torque application.
What is a characteristic feature of long stroke chambers?
Square-shaped air inlet ports and yokes that are welded to the pushrod
These features help identify long stroke chambers.
True or False: The service brake chamber and spring brake chamber operate in the same way.
False
They have opposite functions concerning air pressure application.
Fill in the blank: Dual-brake chambers contain ______ and ______ actuators.
spring brake; service brake
This allows for enhanced functionality in braking systems.
What does the pushrod do in a dual-brake chamber?
Pushes against the forward service chamber push plate to apply the brakes
This occurs when no air is compressing the spring.
