I just installed '82 Toyota 4x4 1/2 ton pickup 4 piston calipers on my '71 240z. All you need to do is cut back the dust shield. It's a direct bolt on. You'll need the right clips and pins....but that's not a problem.
Hi badandy260----------This past weekend, I decided to install new pads on my '70 240. The car was equipped with Toyota 4-piston calipers when I bought it two years ago. I had been under the impression that the calipers were from a '79-'83 Toyota 4-wd, but they turned out to be from an '86. There are several different styles of pads and calipers from '79 to '86. Any of these will fit, providing you trim the dust shield.
I'm using the master cylinder from a '79 280ZX with my setup, but for normal street use the 260 master will work fine. IMO, the most important thing with this or any other brake mod is to THOROUGHLY bleed the system after working on it. This may involve doing the bleeding operation more than once.
Any of the Toyota truck calipers are a direct bolt-on except for trimming or removing the dust shield and bending the brake line to fit the caliper. The 4-cyl calipers are 4 piston but smaller than the v-6 4x4. The only problem you may experience is too much braking in the front. I installed an adjustable proportioning valve to try and compensate but still have more braking in the front than in the rear. I just put the Porterfield endurance shoes on in place of the street/track shoes to see if that would even things up a bit.
Another upagrade to consider is the vented rotors from an '84 300XZ. You need to have a spacer made to fit the 240 hat but you never have to worry about brake fade!