The brake booster assists braking only when the engine is running.
When the car is moving while the engine is not running, or if the brake booster is defective, more pressure on the brake pedal is required to bring the car to a stop.
If this happens, ABS and PSM will also not operate.
Moisture or road salt on brakes affects braking. Brakes will dry after a few cautious brake applications.
Risk of an accident, resulting in serious personal injury or death.
Driving through water may reduce the traction.
Moisture on brakes from road water, car wash, or coating of road salt may affect braking efficiency.
Your car has excellent brakes, but they are still subject to wear. The rate at which they wear depends on how the brakes are used.
Brake system warning light
You can check the functionality of the brake system warning light by switching the ignition to the "On" position and verifying that the warning light illuminates.
Warning light USA
Warning light Canada
If the warning lights in the instrument panel and onboard computer stay on when the engine is running or come on while driving, the brake pads are worn excessively.
Brake pads and brake discs
Wear on the brake pads and brake discs depends to a great extent on the driving style and the conditions of use and therefore cannot be expressed in actual miles on the road.
The high-performance brake system is designed for optimal braking effect at all speeds and temperatures.
Certain speeds, braking forces and ambient conditions (such as temperature and humidity) therefore might cause "brake noises".
New brake pads or linings
New brake pads and brake discs have to be "broken in", and therefore only attain optimal friction when the car has covered several hundred miles or km.
The slightly reduced braking ability must be compensated for by pressing the brake pedal harder. This also applies whenever the brake pads and brake discs are replaced.