Final answer:
Brake drum mounting holes and pilot surface must be matched correctly with its proper hub and round and concentric.
Step-by-step explanation:
Brake drum mounting holes and pilot surface must be matched correctly with its proper hub. This ensures that the brake drum is securely attached to the hub, preventing any looseness or misalignment during operation.
The mounting holes on the brake drum should be round and concentric. This means that they should be perfectly circular and centered around the same axis to ensure a balanced and stable connection.
Having the brake drum mounting holes and pilot surface balanced, matched correctly with its proper hub, and round and concentric is crucial for maintaining the stability and reliability of the braking system.