What tool might be necessary to use when checking brake fluid levels?

When checking brake fluid levels, a specific type of gauge is essential for ensuring accurate readings and proper fluid levels. This gauge helps to measure the fluid level correctly, especially if the reservoir has markings that need to be interpreted. Brake fluid can expand and contract due to temperature changes, and the use of a gauge allows for precise measurement and assessment of the fluid quality.

In addition, it may also aid in determining if there's any contamination within the brake fluid, which is critical for safety and functionality. Proper brake fluid levels are vital for the braking system's reliability; hence, having the correct tools ensures that maintenance checks are done thoroughly and accurately.