08-19-2008, 05:05 PM
I converted to the '78-79 F250 master cylinder when I first did my front disc conversion. Be sure to get a "camper special" or dual piston caliper application. I has a large 1 1/8" piston which works really well without a booster. I had no problems stopping with 35-36" tires. I even ran it when I added my rear discs with no issues.
Now I have added the hydroboost assist and run an '80 Corvette master cylinder. It is designed more for the disc/disc brakes. I swapped because my booster was off of an Astro van and had a narrower mounting bolt pattern.
Another tidbit, I still do not run a proportioning valve. Mostly because I have been too lazy to redo my lines. I have an aftermarket adjustable version to limit the rear and keep them from locking up to easily. But like I said before, I've had no problems yet. In the rain I try to be careful with the panic stops to prevent spinning out, but you have to drive really careful in the rain anyhow with a spool in the rear.
Now I have added the hydroboost assist and run an '80 Corvette master cylinder. It is designed more for the disc/disc brakes. I swapped because my booster was off of an Astro van and had a narrower mounting bolt pattern.
Another tidbit, I still do not run a proportioning valve. Mostly because I have been too lazy to redo my lines. I have an aftermarket adjustable version to limit the rear and keep them from locking up to easily. But like I said before, I've had no problems yet. In the rain I try to be careful with the panic stops to prevent spinning out, but you have to drive really careful in the rain anyhow with a spool in the rear.
'72 TBA...