The application and manufacturing challenges of CNC machined parts in automotive control cables and brake systems are as follows:

Applications:

1. Automotive control cables: CNC machined parts are commonly used in the control systems of automobiles, such as brake cables and clutch cables, to transmit control forces to the corresponding mechanical components and enable the vehicle's control functions.
2. Brake control systems: CNC machined parts are also widely used in automotive brake control systems, including brake discs, brake pads, and other components that are crucial for the vehicle's braking function.

Manufacturing challenges:

1. High precision requirements: Parts in automotive control cables and brake control systems require high precision to ensure the sensitivity of the control system and the safety of the braking system.
2. Wear resistance requirements: Due to the prolonged and high-intensity use of automotive parts, there are high demands for the wear resistance of materials, which increases the manufacturing difficulty.
3. Material selection: Automotive parts typically require materials with high strength and wear resistance. Additionally, material processing properties and costs need to be considered, requiring a balance between multiple factors.
4. Manufacturing processes: Automotive parts often require complex manufacturing processes, such as CNC machining and heat treatment, which demand high stability and controllability in the manufacturing process.

These applications and manufacturing challenges need to be comprehensively considered in the design and manufacturing processes of CNC machined parts to ensure that the quality and performance of the parts meet the requirements of the automotive industry.