Brake Bleeder Screw Function?

Brake Bleeder Screw is a small, hollow screw or valve found at drum-brake wheel cylinders, in disc brake calipers, and adjacent to the outlet ports of some master cylinders. It is opened to release pressure and to bleed air and fluid from the hydraulic system.

This is how it looks.

See the image below :----

This will help.

Thanks.

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