Final answer:
In a dual air brake system, if one system is low on pressure, the brakes will not operate efficiently due to the compressibility of air. Proper pressure is essential to prevent delays in brake engagement and to ensure safe braking performance, especially in heavy vehicles under high-temperature conditions.
Step-by-step explanation:
If one system in a dual air brake system is very low on pressure, it will not operate as efficiently as it should. Air brakes, like those on large trucks and buses, rely on a supply of compressed air to function properly. According to Pascal's Principle, the force applied to a confined fluid is transmitted equally in all directions. However, if air is not properly bled from the system, the compressibility of the gas will cause the brakes to respond more slowly because the air must first compress and warm up before the brakes can engage effectively.
In heavy vehicles, where the brake system is subjected to high temperatures due to prolonged use, such as descending a steep grade, it is crucial that the brake system maintain proper pressure to avoid overheating and potential brake failure (Figure 14.5). Improper maintenance or defects in the air brake system could compromise vehicle safety. In modern vehicle technology, such as hybrid and electric cars, regenerative braking is used to convert mechanical energy into electrical energy, enhancing efficiency and safety.