Select Page

Slack adjusters are an integral component of the braking system in heavy-duty vehicles. They help maintain the proper clearance between brake shoes and drums, ensuring optimal braking performance and safety on the road. Due to constant wear and tear, slack adjusters can become loose or fail over time, leading to brake malfunctions and potential accidents. To avoid such incidents, it’s essential to regularly check your Slack adjusters. But how do you do that? So, we are here to provide you with a full step-by-step guide on how to check slack adjusters in your vehicle.

How to Check Slack Adjusters

Slack adjusters play a crucial role in maintaining the safety and efficiency of commercial vehicles. They are responsible for keeping the brake shoes close to the drums, ensuring that they can stop the vehicle when needed. If slack adjusters fail to function properly, it can result in decreased braking power, which is a serious safety hazard. It’s important to regularly check Slack adjusters. Here are some tips on how to check Slack adjusters:

  • Start by inspecting the overall condition of the slack adjuster. Look for any signs of damage or wear and tear, such as cracks, breaks, or rust.
  • Check the adjustment mechanism next. Make sure it moves freely and smoothly without any resistance.
  • Measure the distance between the pushrod and the brake chamber mounting bracket. This will give you an idea of how much slack is present in the system.
  • If there is too much slack, adjust it according to manufacturer specifications using a wrench.
  • Once you have adjusted the slack, recheck all components to ensure they are still functioning properly.
  • Test drive your vehicle after adjusting the slack to make sure everything feels normal and safe.

What Are Slack Adjusters?

Slack adjusters are used in the braking systems of commercial vehicles such as buses, trucks, and trailers. These devices are responsible for controlling the distance between the brake shoes and the drum or rotor surface. Without slack adjusters, it would be impossible to maintain consistent braking performance and prevent excessive wear on brake components.

The role of a slack adjuster is to compensate for normal wear and tear that occurs over time on a vehicle’s braking system. The device adjusts itself automatically as needed when wear occurs, ensuring that there is always an adequate gap between the brake shoe and the drum or rotor surface. This helps to maintain optimal braking performance while reducing maintenance costs by minimizing wear on other components such as drums, rotors, pads, and shoes.

Types Of Slack Adjusters

There are two types of slack adjusters: manual and automatic.

Manual Slack Adjusters

Manual slack adjusters are one of the most common types of slack adjusters used in heavy-duty vehicles. As the name suggests, manual slack adjusters require manual adjustment to ensure proper brake performance. These types of slack adjusters are commonly found in older vehicles and are slowly being phased out by newer, more advanced automatic slack adjusters.

These are less expensive compared to their automatic counterparts. Manual slack adjusters also have a simpler design, which makes them easier to install and maintain. With proper maintenance and regular adjustments, manual slack adjusters can perform just as well as automatic ones.

There are some downsides to using manual slack adjusters. One issue is that they require regular inspection and adjustment by trained personnel – failure to do so can result in reduced braking performance or even accidents.

Automatic Slack Adjusters

These are critical components of modern braking systems for commercial vehicles such as trucks and buses. They play a crucial role in ensuring that the brakes operate properly, enabling the vehicle to stop safely and efficiently. Automatic slack adjusters are designed to maintain the correct amount of clearance between the brake shoes and drums, which reduces wear and tear on both components while also preventing premature brake failure.

There are two types of automatic slack adjusters: standard automatic slack adjusters (SASAs) and self-setting automatic slack adjusters (SSASAs). SASAs use an internal mechanism that detects changes in brake drum diameter caused by wear. This mechanism then adjusts the pushrod length accordingly, keeping the brakes in optimal working condition. SSASAs take things one step further by automatically adjusting pushrod length based on actual brake performance.

Explore more about oil flammability, by visiting our webpage on this.

How to Replace the Brake Air Clearance Adjuster?

How to Check Slack Adjusters

The brake air clearance adjuster is a critical component of the braking system in any vehicle, as it controls the distance between the brake components and ensures proper operation of the brakes. In this article, we will guide you through how to replace this important part.

Before beginning any repair work on your vehicle, always refer to your owner’s manual for specific instructions and safety precautions that need to be taken.

  • Locate the old adjuster: The first step is to locate the old adjuster and remove it from its position.
  • Prepare for replacement: Make sure you have all the necessary tools and equipment on hand before starting the replacement process.
  • Remove the old adjuster: Use pliers or a wrench to loosen and remove the old adjuster from its position.
  • Install new adjuster: Slide in a new brake air clearance adjuster in place of the one that was removed.
  • Tighten bolts or screws: Securely tighten any bolts or screws needed to hold the new brake air clearance adjuster in place.

How To Install a New Backlash Adjuster

To install a new backlash adjuster,

  • Lift your car on a jack stand and remove the wheel assembly.
  • Locate the brake drum and remove it by unscrewing the bolts holding it in place.
  • Once you have removed the drum assembly, you can access the backlash adjuster. Remove any bolts or clips holding it in place and carefully take out the old part.
  • Insert your new backlash adjuster into its position and make sure it is aligned correctly with other components.


Replacing the brake air clearance adjuster is a crucial step in maintaining the safety and functionality of your vehicle’s braking system. Following the steps on How to Check Slack Adjusters, you can successfully replace this component and ensure that your brakes work as efficiently as possible. Always consult your vehicle’s manual and seek professional help if needed. Don’t neglect your brake system; take action to keep it in top condition and ensure safe driving for you and your passengers.


How do I adjust the air clearance to Check Slack Adjusters on my car?

There are a few ways to adjust air clearance in your car. The most common way is to use the door panel adjusters. You can also adjust the air suspension system, or change the air filters.

What is the purpose of the air clearance adjuster on my car?

The purpose of the air clearance adjuster is to allow the driver to adjust the airflow into and out of the car. This is done by moving a lever on the side of the car.

How do I remove the air clearance adjuster from my car?

The air clearance adjuster is a small, flat, metal device located on the top of the car near the windshield. It’s used to raise or lower the car’s air suspension system. To remove it, first remove the screws that hold it in place. Then use a Phillips screwdriver to pry it off.