[JimP]

I recieved the Master Cylinder I ordered from NAPA today. I attempted to get the one that Jack21 uses on his car. I liked the idea of getting one I didn't have to modify and had the connections on the Pass side and not the Driver side. The one Jack21 got with his kit was D9AZ-2140-A. I cross referenced that on the NAPA site and got 39467. This is what I got.

Jack21 mentioned his was "Aluminum" mine is Iron. Also, this unit has a small front bowl and a large aft bowl. Is this correct for Front and Rear Disc brakes? I know some are recommending Masters with equal size bowls? What's the difference and how does a Drum/Drum master differ from a Disc/Drum master and a Disc/Disc Master. I need an education on Master Cylinders!

My brakes are Baer designed for Mustang II front and the Baer Disc brake upgrade for the Ford 8.8. The front is dual caliper and the rears are single caliper. It would make sense to me that the front bowl would be smaller for the rear single piston calipers and that the front would require the larger bowl for dual piston calipers. Does the size of the bowls indicate the amount of fluid transfer to the brakes front to rear? I was planning on installing an adjustable Prop valve on the rear but I'm wondering with the small bowl if I will get enought braking in the rear to use it. Anyway I'll stop talking now...someone please edumacate me!