Why does it smell like oil when braking?

1. Brake fluid leaks: Brake fluid can leak onto hot surfaces such as brake discs or pads. This can cause an oily smell and may affect brake performance. Check the brake system for any leaks, especially at the brake pipes and connection points near the wheels.

2. Brake disc/brake pad problem: If the brake disc or brake pad is excessively worn or damaged, excessive heat will be generated when rubbing, resulting in oily smell. Check the condition of the brake rotors and pads to make sure they are within proper specifications and are not unusually worn or damaged.

3. Tire or brake dust: Brake dust and green tires may accumulate on the brake components during braking and produce an oily smell when heated. Make sure the tires and brake components are clean and cleaned regularly to prevent buildup.

4. Overheating of the brake system: Overheating of the brake system may cause brake fluid or other components to emit oily smell. This can be caused by overuse or overloading of the brake system. Make sure your brake system is working properly and there are no abnormalities.

Since I cannot directly inspect your vehicle, the above are just some common possible causes. To properly diagnose and resolve the problem, it is recommended that you take your vehicle to an experienced mechanic for inspection and repair. They are able to carry out on-site inspections and provide professional advice and solutions for your specific situation.