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Thanks Scott, turned out to be the brake booster master cylinder rear seal. Out now and hoping to get it rebuilt.
Thanks for pointing me in the right direction.
Dave

Hi 2003 T4 Transporter 2.5 @ 220,000kms here. I have developed a loud hissing noise in the cabin over the last couple of journeys which goes completely when I apply the brakes but returns once off...

Update. Sensor changed over with new OE VW part, no joy. Connections at gauge end next!

Thanks for that, certainly worth a go first, then a fall back position to check connections at gauge end and go from there or fit an engine surface temperature auxiliary gauge.

Thanks for the info. Is the binnacle uniquely coded in anyway as the speedometer/odometer is part of it or would a replacement pick up that data from the ECU? Would anyone know if there is a multi-...

Newbie and new owner of a 2002 T4 2.5 TDI 300 van. Loving it but the temperature gauge is not working. Had it plugged in to VAG COM at nearby dealer and running the engine shows that the sensor seems...

Hi, just acquired a 2002 T4 2.5 TDI 300 Transporter to add to our 2014 VW TDI Golf Wagon and 2012 EOS. Long term VAG, motorcycling and cycling tragic and the T4 will be used to take Ducati...