I'm not sure this will be helpful or not, but I used a 1 1/8" master(aluminum 2-bolt listed for a '79 Dodge pickup from the local store for 20 bucks) on my '69 Coronet with a MagnumHP adapter and I have to practically stand on the pedal to stop it. When I did my '64 Polara 'vert, I used one with a 1" bore(listed as '81 Mirada also from the local store for 20 bucks) and the same adapter and it stops very well with much less effort. I'll be switching the one on the Coronet when I get a chance to the smaller one. Mark ----- Original Message ----- From: "Gary Pavlovich" <glpavlovich@xxxxxxx> To: 1962to1965mopars@xxxxxxxxxx Sent: Tuesday, December 28, 2010 10:00:00 PM Subject: Mopar master cylinders - preference? Hope everyone had a wonderful Christmas. It is time for me to select a Mopar master cylinder for my four-wheel manual disc brake Plymouth. I know staying with a 1" diameter MC piston will reduce the effort needed on the pedal to actuate the manual system but does anyone have exeperience/suggestions as to which Master Cylinder is preferred - the Mopar 1 1/16" billet aluminum from the Diff Doctor ($100 with adapter) or the Mopar cast iron unit sold by Master Power Brake ($89)? The plastic caps on the billet alum. one seem like less chance of spilling the caustic brake fluid as opposed to the swing over bar on the cast iron unit. Let me know from your experience... Thank you, Gary Pavlovich [Non-text portions of this message have been removed] ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! 1962 to 1965 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.html. [Non-text portions of this message have been removed] ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! 1962 to 1965 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.html.