When bleeding brakes on a vehicle with a disc/drum system, which statement is correct?

In the context of bleeding brakes on a vehicle with a disc/drum system, it's important to understand the correct procedure to ensure effective brake performance and safety. When bleeding brakes, the correct approach involves some key practices.

Removing the drums is not typically necessary for the bleeding process. In fact, most vehicles allow for bleeding without needing to disassemble the brake components. The purpose of bleeding brakes is to remove air from the brake lines, which can be done by accessing the bleeder valves on the brake calipers and wheel cylinders.

Regarding the master cylinder, it is important to keep it adequately filled with brake fluid during the bleeding process to prevent introducing more air into the system. If the fluid level drops too low, it can lead to air being drawn into the brake lines, complicating the bleeding process and potentially requiring additional efforts to remove air.

These considerations clarify why the other options regarding the necessity of drum removal and maintaining a low fluid level do not align with best practices for successfully bleeding a brake system. This understanding reinforces the procedures that ensure an effective and safe brake system operation.