Final answer:
When selecting replacement S-cams for automotive applications, it is important to identify if a left or right hand S-cam is required and to check for S-cam roller lubrication. Testing Rockwell hardness is not necessary.
Step-by-step explanation:
When selecting replacement S-cams for automotive applications, an important requirement is to identify if a left or right hand S-cam is required. This is because S-cams are specifically designed for either the left or right side of the vehicle, and using the wrong one can lead to incorrect braking performance.
Another important requirement is to check for S-cam roller lubrication. Proper lubrication is crucial to ensure smooth operation and prevent premature wear.
Testing Rockwell hardness is not typically a requirement when selecting replacement S-cams. Rockwell hardness is a measure of the material's hardness, but it is not directly relevant to the selection of S-cams for automotive applications.