While you might be able to put your rear disc brakes on a drum brake back axle of a Citroen Saxo, it is not recommended, and you could run into several issues. Firstly, it involves significant modifications to the existing structure and involves changing numerous components. Second, the original hub assembly that holds the rear drum will need to be replaced, which could be expensive and time-consuming. Third, you may encounter compatibility issues with other parts, such as the handbrake mechanism.
Therefore, it is generally advisable to use the original drum brakes or consult with a professional mechanic before attempting such modifications.
