Proportion valve

I plan to change to this one of these days on my son's Dart Sport.
You might want to consider this for your master cylinder question:

http://cgi.ebay.com/ebaymotors/ws/e...RK:MEWA:IT&viewitem=&item=280117877372&rd=1,1

For his '74 Dart Sport (drums on all corners) we swapped a disk/drum system over from a '76 Duster, including calipers and combination valve. We bought a replacement M/C from AutoZone. His car was not drivable when we bought it, so I can't tell you the difference in brake feel.

The only problem we have had is the brake dash light came on after just a few days of driving when it was put back together. The system was re-bled and the light came on again the next day. There are no leaks to be found.

Jerry