The materials of automobile brake tubing usually include the following:

1. Galvanized steel pipe: Galvanized steel pipe is a commonly used brake oil pipe material, which has good corrosion resistance and strength and can withstand high pressure and high temperature environment. Galvanized steel pipe is usually used in traditional braking system, which has high reliability and durability.

2. Stainless steel pipe: Stainless steel pipe has excellent corrosion resistance and oxidation resistance, and can be used for a long time in harsh environment without rusting. Stainless steel pipes are usually used in the braking system of high-end cars or performance models, which can provide higher safety and reliability.

3. Copper-nickel alloy pipe: Copper-nickel alloy pipe has good corrosion resistance and thermal conductivity, and can maintain stability in high temperature environment. Copper-nickel alloy tubes are usually used in the braking system of high-performance vehicles or racing cars, which can meet the requirements of high strength, high temperature and high pressure.

4. Polyurethane hose: Polyurethane hose is a kind of soft and wear-resistant brake tubing material, which is suitable for some brake system designs that need bending or bending. Polyurethane hoses are usually used in modified vehicles or racing cars, which can provide more flexible brake system layout and design.

Generally speaking, different materials of brake tubing are suitable for different types of automobiles and brake systems, and choosing the appropriate material of brake tubing can ensure the normal operation and driving safety of the brake system. When replacing the brake oil pipe, the appropriate material should be selected according to the vehicle model, service environment and performance requirements to ensure the reliability and stability of the brake system. It is suggested to seek the help of professional automobile maintenance technicians or repair shops when repairing or replacing the brake tubing to ensure the normal operation of the brake system and driving safety.