That's a good question. We have a thread called
Master Cylinder Upgrade Part Numbers. But I think it only deals with F150 or Bronco brakes.
For your one ton you'll be looking for one with a bigger bore. In Big Blue's parts list document I have this note: "1 5/16” bore, probably ACDELCO 18M886 from a ’99 F450 Superduty." But for your truck you will probably want to get one for another F350. Here's a search from
Rock Auto's catalog for a 1990 F350, and you'll see several there. But make sure you get one with a reservoir - and the residual pressure valve, which you'll need as it adapts the threads to match your brake lines. But I didn't check to see that any of those come with the residual pressure valve, so you'll have to check that out.
Speaking of the brake lines, the newer masters have the front and rear ports switched so you have to bend your lines a bit, but it is easy.
Gary, AKA "Gary fellow":
Profile
Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI
Locked
