Mercedes-Benz Viano Clutch Master Cylinder Replacement Parts

The Viano was only ever sold with an automatic gearbox (the 5-speed 722.6 or later 7G-Tronic unit), so it has no clutch pedal and no clutch master cylinder at any point in its production run from 2003 to 2014. If you are experiencing a pedal or fluid-pressure fault, you are most likely looking for a brake master cylinder instead, which is a completely different component. Double-check your van is not a Vito with a manual gearbox, as the Vito shared the same W639 platform but was available with manual transmission and does use a clutch master cylinder.

Almost certainly yes - because every Viano variant, whether diesel or petrol and regardless of trim level, left the factory with an automatic transmission, meaning no clutch master cylinder was ever fitted to this model. It is worth going back to the breaker and clarifying whether they mean a brake master cylinder, which sits at the bulkhead behind the brake pedal and is the hydraulic component most commonly replaced on these vans. Alternatively, if you have a W639-based van with a manual gearbox, confirm with the breaker whether your vehicle is actually a Vito rather than a Viano.

The W639 Viano ran from 2003 to 2014, with a facelift in 2010 that brought updated styling and some mechanical revisions; there was no separate generation change during this period. Since the Viano never had a clutch master cylinder on any variant, generation boundaries are not relevant to this part. If you are looking for a brake master cylinder, the 2010 facelift boundary is worth mentioning to the breaker, as ancillary and mounting changes around that point are best confirmed against your specific registration.

Trim level makes no difference to drivetrain specification on the Viano; all three trim grades - Ambiente, Trend, and Avantgarde - used the same automatic gearbox options and therefore none of them were fitted with a clutch master cylinder. If you need a brake master cylinder, the engine code (visible on your V5 or via a VIN check) is the most useful detail to give the breaker, as it confirms which engine variant and associated hydraulic system your van has. Trim level is irrelevant to that search.

No - the Viano's diesel engines, including the OM646 and OM642 units used across the range, were all paired exclusively with automatic transmissions throughout the model's life, so no diesel Viano ever left the factory with a clutch master cylinder. The engine code matters enormously for other mechanical parts, but in this case it does not change the answer. If you have a diesel Viano with a hydraulic fault, a brake master cylinder is the component to search for, and supplying your engine code to the breaker will help them find the correct one.