Final answer:
The purpose of antioxidant coatings on the brake assembly pressure plate is to prevent corrosion.
Step-by-step explanation:
The purpose of the antioxidant coatings on the brake assembly pressure plate is to prevent corrosion. The brake assembly is exposed to high temperatures and moisture, which can lead to the formation of rust and corrosion on the pressure plate. The antioxidant coatings help to create a protective barrier that prevents corrosion and extends the lifespan of the brake assembly.