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Frequently asked questions about cars and motorcycles
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The reason why it is necessary to replace the brake fluid periodically.

Model: (Various brands) Various
Part: Brake fluid

What the YouTuber tells us is correct: brake fluid is hygroscopic, meaning it naturally absorbs moisture from the air through the microporosity of the hoses and the reservoirs, even in a closed system like the braking system. Brake fluid has a very high boiling point, which is a fundamental characteristic because brakes generate enormous heat during intense use; the presence of water within the system significantly lowers the boiling point, causing the "vapor lock" that the YouTuber talks about: bubbles of vapor form within the circuit, creating the sensation of a "spongy pedal," which indicates a partial loss of braking power. Additionally, water causes rust and corrosion in the master cylinder, in the pistons that push the pads, and in the ABS/ESP valve: this is why we need to change the brake fluid in our vehicle every two years.

Posted on 17 January 2026 by ScegliAuto

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