TRW PSA743 Brake Servo Vacuum Power Booster Pneumatic Replacement Spare. This brake booster is designed for vehicles without brake assist and is suitable for both right-hand and left-hand drive vehicles. It is compatible with various Audi, VW, and Seat models including Audi A4, A6, and Allroad; VW Passat; and Seat Exeo. The part numbers include 4B3612107, 8E0612107, and others. The diameter is 245mm. Construction years range from 05/1999 to 05/2002 for some models, and 06/2001 to 05/2002 for others. Specific VIN ranges are also provided for compatibility checks.