Do it yourself
Frequently asked questions about cars and motorcycles
Car tutorial (Do it yourself) Motorcycle tutorial (Do it yourself) Frequently Asked Questions

The reason why it is necessary to replace the brake fluid periodically.

Model: (Various brands) Various
Part: Brake fluid

Video tutorial

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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