I'm not sure what the dual diaphragm brake booster is so I'm gonna say no but a previous owner upgraded this a fair amount so they might have done it instead. Any idea on how I can tell?
The stock booster is about 8” in diameter. The dual is about 9.5”.
I haven’t got mine on the road yet to speak from experience, but from all my research it seems upgrading to a 1” bore MC (only) will result in a very stiff pedal. The dual diaphragm booster is needed to get a normal pedal feel.
