Manual disc brakes vs power disc brakes questions

moparmat2000 said
It looks like the 1&1/8 is 1979 dodge truck.

1&1/32" or 1.0313 is 79 volare, 1980 mirada

What does the 15/16" diameter one come off of ?

Based on the chart that 72bluNblu provided, the pickup master may be a bit much at 1&1/8" bore for its 3&1/8" diameter caliper pistons, however the mirada, volare one at 1.03" diameter bore with 2.75" piston calipers will prob work better with manual or power.

Also are the fittings on these aluminum wonders metric or SAE?

The fittings on Dr. Diff's m/c's are SAE, you don't need to make any changes to the brake lines. They're from the later "cloud" cars if I remember right. You can buy them in 1-1/32", which is what they are originally. Cass actually sleeves them down to make the 15/16" version. And like I said, my Challenger runs 11.75" disks and 2.75" bore calipers, the 15/16" works great.

furyus2 said
To reiterate, when I changed ONLY the calipers to the 2.75 bore size, the 15/16 MC that was on the car working for several years, would not move enough fluid to properly operate the brakes. Yes, the pedal did hit the floor. I changed to the 1 1/32 bore, and instant pedal, worked great. End of story.

Except it's a '64 Fury. What's the pedal ratio? The original m/c in that car was a single pot with a 1" bore. There's a lot more to it than just the size of the m/c bore and the piston bore, the piston travel, pedal ratio, and size of the rear wheel cylinders are part of that too. When I converted my old '55 Dodge Coronet to a dual m/c and disk brakes I needed a 1.125" bore master, even 1-1/32" was barely enough to keep it off the floor. But that doesn't mean that all cars with disk brakes need a 1.125" m/c.