Michigan State Brakes Certification Practice Exam

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What is the recommended lubricant for the internal parts of a master cylinder?

Engine oil
Water
Brake fluid
Transmission fluid

The correct answer is: Brake fluid

The recommended lubricant for the internal parts of a master cylinder is brake fluid. This is because brake fluid is specifically formulated to operate effectively within the braking system. It has properties that allow it to maintain performance under high temperatures and pressures typically encountered in braking applications. Using brake fluid as a lubricant ensures compatibility with the materials used in the master cylinder and the entire hydraulic braking system, preventing degradation or damage. Additionally, brake fluid provides the necessary fluidity and viscosity needed to allow for smooth operation of the master cylinder’s pistons and seals, ensuring proper brake function and responsiveness. Other options, such as engine oil, water, and transmission fluid, do not possess the necessary attributes for use in a braking system. Engine oil can break down under high temperatures, water can lead to corrosion and system contamination, and transmission fluid may not be compatible with the materials found in brake systems, leading to potential failures. Therefore, using brake fluid is the most effective choice for lubricating the internal parts of a master cylinder.