So, most guys with Tundras do the Tundra 231mm brake upgrade, but this one will be a little different.
I recently torn down a 4th gen 4runner IFS system. So, these are off of a 07 4th gen Sport Edition model. They will ONLY work with 17" wheels and grinding is required as well as 1.25" wheel spacers. But, the rotors are 338mm in diameter and the calipers are 13WH calipers and are also 231mm.
The advantage is that the rotor is another 1" larger in diameter. The rotor slides over the hub just like any other rotor. But, the caliper is just slightly offset to the inside, so it requires shaving down the inner ears on the caliper where it bolts on. You need to take it down about 1/16" to get it to clear. I also had to grind some inner ears on the caliper a little bit. It all clears now as well. I will also be swapping in a 1" bore master cylinder as well.
16" wheels will not work even with 1.25" spacers. These brakes are BIG.
Also, you need to really watch your brake hardlines where they attach to the new caliper. under full turn, they will get very close to the shock itself. So, you need to route them correctly to make they clear on each side at full turn.
Oh yeah, lift is on as well. Just waiting on wheels/tires to get delivered hopefully today.
Here are the old rotors/calipers
View attachment 336620
New stuff. Look at the backing plate for reference on the size difference in rotors
View attachment 336621
View attachment 336622