Michigan State Brakes Certification Practice Exam

In servicing a dual master cylinder, which action is NOT included in the process?

1. Replace all seals

2. Check for debris in the cylinder

3. Clean the master cylinder with a degreasing solvent

4. Inspect the internal pistons

The correct answer is: Clean the master cylinder with a degreasing solvent

The process of servicing a dual master cylinder involves ensuring that all components function effectively and safely. Cleaning the master cylinder is a critical step to prevent contaminants from interfering with the operation of the brakes. However, using degreasing solvents may not be appropriate due to potential residue or chemical reactions that could harm the materials of the master cylinder or compromise its integrity. In contrast, replacing seals is fundamental to ensure there are no leaks, checking for debris helps maintain clean fluid pathways, and inspecting internal pistons ensures that all moving parts are functioning correctly and do not have wear or damage. Therefore, the action of cleaning with a degreasing solvent stands out as one that is not commonly included in the appropriate servicing process of a dual master cylinder.