Michigan State Brakes Certification Practice Exam

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What might cause the diaphragm in the master cylinder cup to be swollen?

Low brake fluid levels
Contaminated brake fluid
Silicone fluid added to the system
Excessive heat exposure

The correct answer is: Silicone fluid added to the system

The diaphragm in the master cylinder cup may swell when silicone brake fluid is added to the system. This is because silicone-based fluids have different chemical properties compared to conventional hydraulic fluids. The materials used in the diaphragm may not be compatible with silicone fluid, leading to a chemical reaction that causes the diaphragm material to swell or degrade. This understanding highlights the importance of using the correct type of brake fluid as specified by the vehicle manufacturer, as well as recognizing the potential for damage when incompatible fluids are introduced into the braking system. Proper maintenance and awareness of fluid specifications are critical to ensuring the integrity and functionality of braking components.