What are slack adjusters?

Slack adjusters are a vital component in the braking system of heavy vehicles, particularly in S-cam brake systems. They automatically adjust the brakes to compensate for lining wear, ensuring that the brakes maintain proper functioning and efficiency. The primary purpose of slack adjusters is to reduce brake slack, which helps maintain the appropriate amount of tension in the brake system for effective stopping power.

In systems where brakes wear down over time, slack adjusters automatically take up the extra space caused by the wear, thus ensuring that the braking distance remains consistent and safe. This reliability is crucial for heavy vehicles, which rely on strong braking systems to operate safely on roads. Hence, option B accurately captures the essential role slack adjusters play in maintaining brake performance and safety.