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Brakes Published 12 Apr 2005 Ref JP-1212191

Mercedes-Benz: Pressure Control Transmission Unit

Translated from Japanese · machine translation

Safety-critical recall — brakes. If your vehicle is affected, contact your dealer before driving.
Country
Japan
Published
12 Apr 2005
Units affected
41867
Reference
JP-1212191

Affected vehicles

Mercedes-Benz E240 2001–2005 Mercedes-Benz E240 Station Wagon 2001–2005 Mercedes-Benz E320 2001–2005 Mercedes-Benz E320 4MATIC 2001–2005 Mercedes-Benz E320 4MATIC Station Wagon 2001–2005 Mercedes-Benz E320 Station Wagon 2001–2005 Mercedes-Benz E350 2001–2005 Mercedes-Benz E350 4MATIC 2001–2005 Mercedes-Benz E350 4MATIC Station Wagon 2001–2005 Mercedes-Benz E350 Station Wagon 2001–2005 Mercedes-Benz E500 2001–2005 Mercedes-Benz E500 Station Wagon 2001–2005 Mercedes-Benz E55 2001–2005 Mercedes-Benz E55 Station Wagon 2001–2005 Mercedes-Benz SL350 2001–2005

Hazard

The hydraulic pump piston of the electronically controlled hydraulic brake system (a braking device that controls hydraulic pressure based on brake pedal input) has been improperly machined, resulting in the guide disc that supports the piston not being correctly press-fitted. This can prevent normal hydraulic pressure output. When the pressure sensor detects abnormal pressure, emergency control functions activate and the system switches to a hydraulic circuit without power assistance, potentially resulting in reduced braking effectiveness under normal pedal force.
Show original (日本語)
①電子制御式油圧ブレーキ(ブレーキペダル操作量を検知して油圧の量を制御する制動装置)の油圧ポンプピストンの加工が不適切なため、ピストンを支えるガイド・ディスクが正しく圧入されておらず、正常な油圧を出力できないことがある。そのため、圧力センサーが圧力の異常を感知して、緊急対応用の機能が作動し、倍力作用が得られない油圧回路に切り替わるため、通常の踏力ではブレーキの効きが悪くなるおそれがある。

Remedy

All vehicles will be inspected, and those with the defect will have the electronically controlled hydraulic brake unit replaced with a serviceable unit. As a temporary measure due to delayed availability of serviceable units, all users will be notified of the defect details and the unit will be replaced with a serviceable one at a later date.
Show original (日本語)
①全車両点検し、該当するものは電子制御式油圧ブレーキ・ユニットを良品と交換する。なお、良品の電子制御式油圧ブレーキ・ユニットの供給に時間を要することから、当面の暫定処置として、全ての使用者に不具合内容を通知し、後日良品と交換する

Official source

View the official recall notice