1. Park the vehicle on a level surface, apply parking brake, and chock the wheels.
2. Inspect the slack adjuster visually. Look for any signs of damage, such as cracks or broken parts.
3. Check the slack adjuster's travel. Pull the adjuster lever all the way out, then push it all the way in. The adjuster should move freely and smoothly, without any binding.
4. Check the slack adjuster's adjustment. Park on level ground with the parking brake on. Measure the distance from the center of the brake camshaft hole to the brake shoe lining on both sides of the axle. The measurements should be the same.
5. Check the slack adjuster's mounting. The adjuster should be mounted securely in place.
6. Check the slack adjuster's linkage. The linkage should be free of any damage, and it should move freely and smoothly.
If any of these checks reveal a problem with the slack adjuster, it will need to be repaired or replaced.
Note: Always refer to the specific vehicle manufacturer's guidelines and recommendations for inspecting the slack adjusters in commercial vehicles.
