VW power brake servo. The power brake servo is what provides the power assist in your Jetta or New Beetle equipped with ESP. When it starts to fail you will notice that much more effort is required to stop the car, or your brake pedal will go straight to the floor and barely stop the car. Servos can’t be repaired, so you will need to pick up this new high quality, direct fit replacement to make your Volkswagen stop safely again.
Besides your VW power brake servo other parts of your brake system may cause your brake pedal to feel different than it did when your Jetta or New Beetle left the Volkswagen factory. One part would be the brake check valve, which holds the vacuum in the booster. It could also be your master cylinder failing.