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Breathers act as an inlet to your vehicle’s crankcase. They help prevent contaminants from entering the air filter.



What are Breathers?

Breathers are the other half of a crankcase emission system. A breather filter cleans the air that is drawn to the crankcase and later let out by the PCV valve.

How do Breathers Work?

Breather filters usually are contained in a slot or small box that connects to the air box then to crankcase. They clean the air that travels through it.

How are Breathers Made?

Most breathers are a block or square of media material that is cut or formed.

Why do Breathers Fail?

  • Type of duty impacts life or failure.
  • They can become clogged and need to be changed every 12 months or 12,000 miles.

What are Symptoms of Breather Failure?

  • Rough idle.
  • Difficulty starting
  • Poor fuel economy
  • Check engine light illuminates.

What are Implications of Breather Failure?

  • Car will not start.
  • Engine failure.

If you have questions or concerns about breathers, your vehicle’s emissions system, or any of your vehicle’s components, come into your local Pep Boys where we can answer any question, help you find any part or perform any vehicle service your vehicle may require.

If you want to learn more about other car parts, especially as they apply to breathers, we recommend reading up on intake manifolds , mass airflow systems and oxygen sensors