What does it mean when the braking pedal sinks down when you start the engine as you press the pedal?

Description

Annex 1 pt. 5.1.4 p. 11986 of the Regulation of the Minister of Infrastructure of 18 September 2009 on the scope and method of conducting tests (Journal of Laws No. 155, item 1232)

Explanation

Correct answer: That the power brake system is working.

This is a normal symptom indicating the proper functioning of the brake assist system (the so-called servo). After starting the engine, the servo is activated and begins to assist the braking force, which is felt as the brake pedal 'sinking' slightly. This is a simple way to check before driving whether the brake booster in the vehicle is working correctly.

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