There are two types of slack adjusters, manual and automatic. Manual slack adjusters need to be adjusted manually and are less commonly used in modern-day vehicles. Automatic slack adjusters, on the other hand, are now standard, making vehicle maintenance much easier.

The slack adjuster works in conjunction with the air brake system, which uses compressed air to provide the force necessary to activate the brakes. When air is applied to the brakes, it causes the slack adjuster to move the brake shoes towards the brake drum. As the brake shoes move closer to the drum, the slack adjuster adjusts their position until the brakes are in the correct position. Once the brakes are in the correct position, the slack adjuster then holds them there, ensuring that proper braking pressure is achieved.

It is vital to ensure that slack adjusters are appropriately maintained, as they are key to ensuring the effectiveness of the air brake system. Regular checks and maintenance should be carried out to ensure that slack adjusters are not corroded, worn, or damaged, which could cause them to malfunction. Any malfunctioning slack adjusters should be replaced immediately to ensure the safety of the driver and passengers.

In conclusion, slack adjusters are a crucial component in the air brake system of commercial vehicles. They ensure that the brakes are acting correctly and that the vehicle can stop safely. Therefore, proper maintenance of the slack adjuster is essential in ensuring both the safety of the driver and passengers, as well as efficient operation of the vehicle.