About Jesse Moser Expertise I specialize in the Plymouth Duster from 1970 to 1973, allthough 1974 through 1976 Dusters are nearly identical. 340s, Twisters, Feather Dusters (the cars!), whatever "A" body Duster you have, I can probably give you some info.
Experience I own a 1973 Duster with the Twister options package. I've been searching for information on this specific car since 1995 and have acquired much general and specific knowledge in the process.
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Question I have a '73 Golduster. Power Steering NO Power Brakes. Can power brakes be added and what do you have to do to add them. All 4 wheels are drum brakes now. Car is all origional with 37,ooo miles.
Answer Allen, Although I have never done anything like this before, I believe all that is involved is replacing the manual master cylinder with a power master cylinder. I don't know if the mounting bolts are in the same location or not. From there you would need to hook up the vaccuum lines for the booster and possibly install new brake lines on the front, though if the old ones are in decent shape you may be able to reshape them if the fittings are the same size.
I know this swap is fairly common so concrete information is out there, but since the manual disc/drum brakes work fine for me on my '73 V8 I haven't done it myself. I suggest searching the internet and magazines for better information. Sorry I couldn't help further.