What are the disadvantages of a dual master cylinder?

A dual master cylinder can be more complex and may require more maintenance than a single master cylinder system. In the event of a failure in one circuit, the other circuit may still function, but it can lead to uneven braking force, potentially compromising safety. Additionally, the installation and bleeding process can be more complicated, which might increase repair costs. Lastly, the added complexity can result in a heavier and bulkier system, impacting vehicle weight and design.