The brake system of this model during operation has some unpleasant nuances. If a sharp "grower" sound is heard when a gas pedal is pressed, the diaphragm or the return valve of the vacuum amplifier is likely to be defective. The problem can be addressed by replacing the brakes with the brakes.
The sharp screwup of brakes on braking is another pretty common problem with Polo Sedan. Technical specialists recommend clearing the rear brake drums several times at a speed of approximately 60 km\h.
