When cleaning a disc brake rotor after machining, what is the recommended cleaning solution?

• A. Soap and water
• B. Brake cleaner
• C. Acetone
• D. Engine degreaser

Answer: (A)

The recommended cleaning solution for cleaning a disc brake rotor after machining is brake cleaner. Brake cleaner is specifically designed to remove contaminants like oil, grease, dust, and other residues that can affect braking performance. It evaporates quickly and leaves no residue, ensuring that the brake rotor is clean and ready for installation.

Using soap and water, while it may clean the rotor, can leave behind residue that could interfere with the brake function. Additionally, it might not effectively remove all oils or metal shavings left from machining. Acetone is a strong solvent that can work for cleaning, but it may not be optimal due to its potential to dry out or damage any rubber components nearby. Engine degreaser is formulated for automotive engine parts and can be effective in removing grease but may not evaporate as quickly or be as safe for use around brake systems. By using brake cleaner, technicians ensure they are employing a solution that is safe, effective, and designed specifically for the brake system.