Why is the brake of Volkswagen Sagitar hard to press?

[VanBrooklyn]

Reasons for the hard-to-press brake in Volkswagen Sagitar are introduced as follows: 1. Leakage or failure of the car's vacuum booster pump: The force to press the brake pedal needs to be amplified by the brake booster pump. If it fails, the brake loses its main force, making it difficult to press down. 2. Pressing the brake after engine shutdown: This leads to booster pump failure. The brake booster pump continuously generates vacuum only when the engine is running. When the engine is off, it relies on the residual vacuum from previous operation. After a few presses, the vacuum state cannot be maintained, resulting in the phenomenon of the brake being hard to press. However, this condition will recover after starting the engine and is not a malfunction.