Risk Of Accident When Commissioning The Vehicle Due To A Lack Of Braking Effect When The Service Brake Is Operated For The First Time After Repair Work - AS42.50-Z-0002-01A

WARNING: This page is about a different car, the 2023 Mercedes-Benz GLC300, 2022 Mercedes-Benz GLC300, 2021 Mercedes-Benz GLC300, 2020 Mercedes-Benz GLC350e, and 2020 Mercedes-Benz GLC300. However, it is still accessible from the selected car via links, so may be relevant.

Model all (4xWD, CAR, Light transporter, smart)

Before starting the engine, actuate brake pedal several times until pressure is built up and maintained in the brake system.

Risk of accident

After performing work on the hydraulic section of the brake system, an accident may occur due to a lack of braking effect upon the first operation of the service brake.

Safety precautions/instructions

After completing work on the hydraulic section of the brake system and before starting the engine, actuate the brake pedal several times until pressure is built up in the brake system.
When pressure is built up in the brake system, the brake pedal must be held in this position for approx. 30 s to ensure that the pressure in the brake system does not drop.