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Aluminum alloys are commonly used for forging brake calipers due to their strength, lightweight, and corrosion resistance. The specific aluminum alloy used will depend on the required performance and strength properties of the caliper, as well as the type of vehicle it will be used on. Some common aluminum alloys used for forging brake calipers include:

2024-T4 - This alloy has high strength and is commonly used in aircraft applications. It has good fatigue resistance and can be heat treated for improved strength.

6061-T6 - This alloy is a general-purpose aluminum that is commonly used in a wide range of applications. It has good strength and is relatively easy to work with.

7075-T6 - This alloy has very high strength and is often used in high-stress applications, such as aircraft and race car components. It is more difficult to work with than other aluminum alloys due to its high strength.

A356-T6 - This alloy is a casting alloy that is commonly used for brake calipers. It has good strength and can be heat treated to improve its strength and wear resistance.

Ultimately, the best material for an aluminum forging brake caliper will depend on the specific requirements of the application. It is important to carefully consider the required performance and strength properties, as well as any other factors that may be relevant, such as cost and availability.