FAA AMT Airframe Practice Exam 2026 – All-in-One Study Guide to Master Aviation Maintenance Technician Certification!

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If a hydraulic brake system uses neoprene rubber packing materials, the correct hydraulic fluid to service the system is?

Synthetic base oil

Vegetable base oil

Mineral base oil

Neoprene rubber packing materials are compatible with mineral base oil. Mineral base oil is commonly used with neoprene seals and packing in hydraulic systems due to their compatibility. Using the correct hydraulic fluid that is compatible with the materials in the system is crucial to prevent leaks, damage to seals, and overall system performance. Therefore, in this case, mineral base oil is the correct choice for servicing a hydraulic brake system that uses neoprene rubber packing materials.

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Phosphate ester base oil

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