Power brake boosters

[375instroke]

What's so great about the smaller diameter Bendix booster besides originality?  Installed '70s style discs on my '69 drum/drum power brake Charger.  11.75" rotors, 2.75" pistons, have 15/16" and 1-1/32" masters to choose from, and I only have the flatter looking booster the car came with.  The FSM shows the larger master for power discs, but some sources say the smaller one, or 1" master is the one to use.  I've driven manual disc Darts and 3/4 ton vans with no problem.  How could a car with a booster need the smaller master or more booster assist?  Is the drum booster OK to use?  I'm sure you know an original booster isn't the easiest thing to find at a reasonable price.

[Mopar Nut]

What's so great about the smaller diameter Bendix booster besides originality? 

Bendix has dual diaphragm and more pressure for stopping.

[375instroke]

OK, but I've owned manual disc Darts, and that van with manual discs was no lightweight, and they were easy to operate.  I can't imagine the drum booster wasn't powerful enough.  I've always hated power brakes.  It feels like there's a balloon between my foot and the master cylinder.  This applies to all cars, old and new I've driven, so it's just my personal preference, and not related to old or defective parts, so I've never payed attention to the details of power brakes.  I'd run manual discs now if I had the parts, but this is what I have to work with right now.  I always thought the use of the Bendix was because of a size limitation with Hemis and Darts, and the dual diaphragm was to compensate for the small diameter.  Apparently I'm wrong.  I'm going to try the 1-1/32" master, with driver's side outlets now and see what happens.

[Bronzedodge]

I'm not sure if the diameter is the reason, or if this something to do with travel.  But all Mopars from back in the day had dual diaphragm on disc cars and single diaphragm on drum cars, A body, B body, E body, etc.   May have been behind GM in sales but #1 in engineering - they did it for a reason.  I converted to disc and the factory drum booster did not "feel" right or something was off.  69 Bendix booster solved the problem.