If one air system in a dual air brake system is very low on pressure:
Answers
None of the brakes will work at all.
Either the front or rear brakes will not be operating fully.
There will be no noticeable affect.
Lights on the outside of the tractor will flash.
The Correct Answer and Explanation is :
The correct answer is: “Either the front or rear brakes will not be operating fully.”
Explanation:
In a dual air brake system, which is commonly used in commercial vehicles such as trucks and buses, the braking system is divided into two separate circuits (usually one for the front brakes and one for the rear brakes). This setup is designed for safety, so that if one system fails, the other can still function, providing a degree of redundancy.
Each system operates with air pressure to activate the brakes. The front and rear brake circuits typically have separate reservoirs and air lines, meaning that if one circuit is low on pressure, it will only affect one set of brakes (either the front or rear). In most cases, when the air pressure in one of these circuits drops below a certain threshold, it will result in a partial loss of braking ability for the affected axle. This could manifest as weaker braking force or, in severe cases, no braking at all for the affected wheels.
Here’s what happens:
- Low air pressure in one system: If one of the air systems is low on pressure, the vehicle’s air brakes will still function, but only on the system with sufficient pressure. The brakes on the other axle (front or rear) will either have reduced braking force or may not function fully. This could be dangerous, especially in emergency situations or when the vehicle is heavily loaded.
- Air brake warning systems: Many commercial vehicles are equipped with warning devices that monitor air pressure. If the pressure in one system falls too low, an indicator light will typically illuminate on the dashboard to warn the driver. However, the situation will not lead to a complete loss of all brakes, as long as one system is functioning properly.
In summary, a low air pressure in one system will impair the performance of either the front or rear brakes, not cause a total brake failure.