Last year I fitted a servo and associated master cylinder from a later T2 2litre to my 71 bay.
It took me three days. This included threading a copper pipe through the chassis front to rear for the vacuum. This took some hours since my van has belly plates which I did not want to remove. Make sure your inlet manifold is the type with a servo pipe takeoff below the carb.
Its a bit fiddley. You have to recover the bracket from between the two beams from the donor vehicle and weld it in exactly the right place on your bus because clearances are very tight.
On a rhd. van you need to reverse the operating lever on the pedal shaft to get the right operating angle for the rod that connects to the servo. This means you have to grind a new recess in the pedal shaft to allow for the cotter pin being 180 degrees out.
You also need to slightly re-route the early handbrake cables so they clear the servo.
The tube connecting the reservior to the master cylinder has to be extended and is fiddly to bleed or you can re-site the reservior behind the seat as in later models.
That said, it was well worth all the work because the bus is transformed. It now brakes like a modern vehicle. No more bulgy eye syndrome when trying to stop at speed when laden.
For years I had been relying on glasses to limit the amount of eye bulging. Although it worked, I never felt this was a good technical solution to the problem. Had I realised how much of an improvement a servo would make I would have done this mod a very long time ago.
