I did this brake upgrade in 2011. Here is my post with pics on Marlin Crawler. T100 Brake Upgrade - https://board.marlincrawler.com/index.php?topic=77523.0
I'm going with 17" wheels on my current build so I'm going bigger on the brakes on this build. Good luck with whatever you decide.
It's been a few years since I did it. It was pretty much bolt on. I think I had to adjust the length of the rod to the pedal linkage. Maybe bend lines a little? Nothing major.
Front Range Off Road and Sky Off Road Designs. They both sell brackets or entire kits for the larger brakes.
gnob nailed it.
When I went bigger front brakes for the bigger tires it definitely helped.
The dual diaphragm booster made a BIG difference. I think I did just leave the master cylinder on it from the donor truck.
The proportioning valve will help keep the rear brakes from locking up too...
I also want to say there are bigger Taco, 4Runner and Tundra front brake upgrades. (Using IFS wheel hubs) I am looking into it for my 86 build.
The T100 (and 95 4runner I think) brakes on my 88 cleared my 15" Cragar Soft 8 steel wheels with 4" back space. This is on an 85 SFA with the typical...
On my 88 pickup I installed T100 calipers and discs up front. Stock rear drums and just tied the proportioning valve fully up. We put a Wilwood adjustable proportioning valve on my son's 91 and it worked about the same as tying the stocker up.
The biggest improvement was installing a dual...