Vacuum Pump or Brake Depressor - Symptoms and How It Works

In this video we will talk about the vacuum pump or brake depressor of our car. We will see how it works, symptoms such as a hard brake pedal, what it is for and how to test it.
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This video also tries to address topics such as:
Hard brake pedal.
Egr. failure
Central locking failure.
Brake seal oil.
How the vacuum pump works.
Vacuum pump symptoms.
Turbo variable geometry failure.