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Hydraulic disc brakes use fluid (either mineral oil or automotive brake fluid) to transmit brake pressure from the handlebar levers to the disc brakes on the wheel.

6 votes

Why did the hydraulic disc brake stop working when riding down a steep mountain?

Though there are some very good answers here already, I get the impression you are more interested in why the brakes suddenly stopped working after you stopped riding for a moment. I am not a brakes …
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