What should brake shoes or pads ideally be free from?

Brake shoes or pads should ideally be free from oil, grease, or brake fluid because these substances can significantly impair braking performance. When brake shoes or pads come into contact with oil or grease, they cannot create the necessary friction needed to slow down or stop the vehicle effectively. This could lead to longer stopping distances and increased risk of accidents. Ensuring that the braking components remain clean and free of any liquid contaminants is essential for maintaining optimal brake function and vehicle safety.

While cleanliness from debris and dust, moisture and rust, and wear and tear is also important, the presence of oil, grease, or brake fluid poses a more immediate danger to the effectiveness of the brakes.