Automotive Glossary

Automotive Glossary

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Power drive unit

Pearls (Pearlescents)

Finishes which include mica flakes in addition to the pigment and binder. These finishes are highly decorative and often give the impression that the colour alters as the viewing angle is changed.


Power Enrichment Control Valve


The failure of a paint film to adhere to its substrate. Peeling results when contaminated surfaces are painted, when there is an excessive difference between paint and surface polarity or thermal expansion, or when there is solvent incompatibility.


The Pentagon, is a government building with five sides that serves as the headquarters of the United States Department of Defence. A pentagon, is a five sided shape.


The proportion of one part of something to the whole. Usually out of 100 (‘per' means ‘out of' and ‘cent' means ‘hundred').

Percentage Change

Changed amounts divided by the original value, then multiplied by 100.

Perceptual Safety

A reference to how safe the driver and passengers feel.


The sum of all the outside edges of a shape.


Description of how some components, particularly if rubber-based, can decay.

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