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1. The brake oil needs to be changed regularly to ensure smooth operation of the brakes.
刹车油需要定期更换，以确保刹车的顺畅运作。
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2. The mechanic checked the brake oil level and replaced it with fresh oil.
机械师检查了刹车油的水平，并用新鲜的油进行了替换。
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3. The car's brake system is a critical component that requires regular maintenance to function properly.
汽车的刹车系统是一个重要的组件，需要定期维护才能正常工作。