Manitoba Airbrake Practice Exam

The failure of automatic slack adjusters is primarily linked to a lack of maintenance or corrosion. These components play a crucial role in ensuring that the brakes are properly adjusted and function effectively. Over time, if slack adjusters are not maintained, they can become corroded, especially if exposed to moisture or harsh environmental conditions. Corrosion can impede their movement and cause them to fail to adjust the brake shoes properly. This improper adjustment can lead to decreased braking performance, resulting in longer stopping distances and increased wear on brake components.

Factors such as improved maintenance techniques would actually help prevent failures, while excessive oil lubrication could lead to a slippery surface that may hinder the adjuster's function rather than cause it to fail. Frequent usage of the brakes typically keeps the system in motion and can aid in adjusting, although excessive use can lead to wear over time, it is not the primary cause of failure for the slack adjusters. Therefore, a lack of proper maintenance, which can include neglect, failing to inspect for corrosion, and not keeping components clean, is a significant factor in why automatic slack adjusters may fail.