FJ80 Brake Master vs Tacoma Brake Master

[Stoffregen Motorsports]

toyota brake stuff is confusing.

It's hard to find a good source of really accurate information. Polling people on Toyota master cylinders, you're as likely to get a strange look and a quote from Full Metal Jacket. It has to be one of the most overlooked aspects of building a Toyota truck today.

 

[Gifu]

poking around, came across this old post.
I'm in the midst of upgrading the calipers on an FJ60 to the V6 4Runner ones (little bit larger total piston surface area, larger pads). I'm keeping the stock master... It seems to me if I upgrade to 1" bore, I'll negate the affect of larger slave pistons vs master piston.
Along the same conversation, the booster to master adjustment is key for pedal pressure. I found this neat little tool that took all the guess work out of it:

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[DaveInDenver]

that would make sense, because i think that the v6 1" bore mc came out in 1990.

That would be 1989 in Pickups and 1990 in 4Runners. The 1" bore master is part of other brake improvements in the 89+ (3rd gen) mini trucks that went from 8" rear drums to 10" and vented front rotors.

"Fits 1979-1995 Pickup/4Runner. Features 1" piston. Works with drum rear brakes. " https://www.marlincrawler.com/brake/master-cylinder/big-bore-v6-hilux-brake-master-cylinder

the 1" master for rear disc, not drum, is more expensive, and if you look at the page title, they are calling it fj80: " Master Cylinder features 1" piston and residual valves for both front and rear disc brakes. Can be used with disc or drum brakes." http://www.lowrangeoffroad.com/master-cylinder-1-bore.html

The 89+ master and FJ80 masters are similar but the version with a residual valve for rear disc brakes is more expensive. However if you need it then you need it.