It transmits the brake pedal depressing force to the brake cylinders via hydraulic pressure. The hydraulic pressure of the brake fluid pushes the brake pad or brake shoe against the rotating disc rotor or drum thus decelerates or stops the vehicles.
It will deteriorate due to contamination from moisture in the air and frictional heat generate by the brake pad.
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When left unreplaced, moisture gets into the fluid and lowers the boiling point, resulting in air lock bubble in the brake piping and causes spongy feel of the brake pedal.
In worst case, there will be total brake failure.
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