I am a new 240Z owner and wanted some suggestions for upgrading and improving the brakes on a 1971 240Z. Can I put

disk brakes on the rear and get a different master & booster?

One of the more popluar Upgrades for 240Z's is to get the 4 piston brake calipers from mid 1980's Toyota 4X4 trucks and install them. It's a straight bolt on deal. You just have to trim the backing plate a bit for clearance to the caliper. You can also get a ZX Master Brake cylinder to move more fluid with the larger calipers.

One of our members, Ross Corrigan ;has a business called Modern Motorsports ( at http://www.modern-motorsports.com/ ) and sells an upgrade kit for Z's that sounds interesting. He can hook you up with the stuff to do Disc Brakes on the Rear as well. Check him out.

If you do a Forum Search here, you should come up with plenty of tips on the brake upgrades and where you can find the parts.