Wagner Brake Thermoquiet Semi-Metallic Brake Pad Set

A brake is a mechanical device that inhibits motion by absorbing energy from a moving system. It is used for slowing or stopping a moving vehicle, wheel, axle, or to prevent its motion, most often accomplished by means of friction.

Metallic may be a reference to:

• Metal
• Metalloid, metal-like substance
• Metallic bonding, type of chemical bonding
• Metallicity, in astronomy the proportion of elements other than helium and hydrogen in an object
• Metallic color, a color that gives the appearance of metal
• Metallic dragon, a classification of dragon found in the role playing game Dungeons & Dragons
• Metallic paint, paint that provides the appearance of metal
• Heavy metal music, a genre of rock music

Semi- is a numerical prefix meaning "half". The prefix alone is often used as an abbreviation when the rest of the word (the thing which half of is being described) is clear from context.

Semi or SEMI may refer to: