Brake Bleeding Tools & Hydraulic Diagnostics

Why should the brake fluid reservoir cap be cleaned thoroughly before opening to add fluid?

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 Correct IncorrectEven microscopic road dirt grit falling into the reservoir will scratch master cylinder rubber cups and jam tight-tolerance ABS solenoid valves.

Why should the brake fluid reservoir cap be cleaned thoroughly before opening to add fluid?

• To keep hands clean while checking the dipstick
• To prevent the plastic cap from sticking
• To prevent microscopic abrasive grit from contaminating the master cylinder seals and jamming micro ABS valves
• To inspect the cap color code