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Old 05-18-2021, 09:19 PM #1
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Tundra Brake Upgrade time?

So Ive had a bit of a sticky piston issue going on with my brakes for the last couple of years thats been just been a small annoyance at most. Well now the Spring is finally well under way, one of my pistons decided to stay stuck until I was able to pull over and mash on the brake. Needless to say, the smoke and the large amount of brake dust is more motivation than I need to finally replace the factory calipers after 235k miles of loyal service.

All that being said, Ive read plenty of the articles on what to do but cant find a solid answer if these rims will work after the upgrade or is it safer to just go with direct replacement?

TRD Off-Road Wheel - 2nd Gen
Part# 42611-AD031 (42611-AD030)
Dimensions: 16x7 +30



Im currently running these

4Runner 3-Spoke Wheel
Part# 42611-35140 (42611-35130)
Dimensions: 16x7 +16
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Old 05-18-2021, 11:35 PM #2
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Hard to find Specs, Info & Measurements on 231mm 13WL Tundra Calipers & Rotors

Post #3 in this thread has a list of wheels that fit. I was lucky in that mine came with 5 stars, which clear fine.
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Old 05-19-2021, 12:20 AM #3
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Quote:
Originally Posted by thenightman View Post
Hard to find Specs, Info & Measurements on 231mm 13WL Tundra Calipers & Rotors

Post #3 in this thread has a list of wheels that fit. I was lucky in that mine came with 5 stars, which clear fine.

Thanks so much, I should have looked a bit more into the 231's. I thought due to the more positive offset, I would need to use the 199's.
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Old 05-19-2021, 12:53 PM #4
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the wheels in lower picture wont work and the link that thenightman posted is very valuable.
One thing to keep in mind. The stock spare wheel will not fit the TBU. IF you get a flat in front you have to put spare on back and move back to front. Or carry a spacer to use the stock spare., or some just have spacers on front anyway. Maybe thats not an issue with the 199 caliper....was with the bigger.

My spare is a wheel that will fit, stock 5 star, and I set it up that way not only for the TBU but now I do 5 wheel rotations
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Old 05-19-2021, 01:24 PM #5
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Quote:
Originally Posted by 3bears View Post
the wheels in lower picture wont work and the link that thenightman posted is very valuable.
One thing to keep in mind. The stock spare wheel will not fit the TBU. IF you get a flat in front you have to put spare on back and move back to front. Or carry a spacer to use the stock spare., or some just have spacers on front anyway. Maybe thats not an issue with the 199 caliper....was with the bigger.

My spare is a wheel that will fit, stock 5 star, and I set it up that way not only for the TBU but now I do 5 wheel rotations
Thanks for the heads up! Guess I'll get my fronts swapped and run mismatched for a week. Oh and already got a 5th 5-spoke for the spare swap as well.
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Old 05-19-2021, 04:41 PM #6
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I have those 'snowflake' wheels (AD030/31, your first pic) on mine, and while I am running 1" adapters on it now, I did run them without spacers or adapters with the 231mm Tundra brakes earlier on. Everything fits just fine.

And concur with the above, the stock 'double tri-spoke' style wheels will not fit with the larger brakes without a pretty good sized spacer.
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Old 05-19-2021, 05:20 PM #7
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Tundra Brake Upgrade time?

Quote:
Originally Posted by JohnMc View Post
the stock 'double tri-spoke' style wheels will not fit with the larger brakes without a pretty good sized spacer.
Do you think a 1.25” spacer would provide enough clearance for the split-spoked wheels?
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Old 05-20-2021, 08:24 AM #8
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Quote:
Originally Posted by cl4Rk View Post
Do you think a 1.25” spacer would provide enough clearance for the split-spoked wheels?
Refreshed my memory, all it took for them to fit was a 1/4" spacer (which was a bit iffy in terms of thread engagement with regular lug nuts). So 1.25" spacers - no problem at all.
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Old 05-20-2021, 03:00 PM #9
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If you are replacing the calipers anyway then 100% agree do the TBU. I also have the Tacoma TRD wheels on my 4Runner and they clear the larger 231mm calipers with no issue. To be honest there's not a whole lot of benefit going to the 199mm calipers since you won't gain extra stopping power.
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Old 05-20-2021, 03:13 PM #10
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Quote:
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If you are replacing the calipers anyway then 100% agree do the TBU. I also have the Tacoma TRD wheels on my 4Runner and they clear the larger 231mm calipers with no issue. To be honest there's not a whole lot of benefit going to the 199mm calipers since you won't gain extra stopping power.
Are you comparing 199mm to stock or 231mm?
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Old 05-20-2021, 06:15 PM #11
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My brakes sadly has the vibration while heavy braking so I might consider this in the future instead of replacing just the disc and pads. How much would this project cost on average guessing?
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Old 05-20-2021, 09:39 PM #12
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A few weeks ago I installed the 231mm caliper on my 2000 T4R with no clearance issues. No spacers needed with my new wheels. Replaced the original 15" wheels.
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Old 05-20-2021, 09:42 PM #13
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I noticed a huge difference in stopping. Go with the 231mm if you can. You won't regret it. Just do some more homework and ask questions so the 231 fits with no issue.
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Old 05-21-2021, 12:07 PM #14
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Quote:
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Are you comparing 199mm to stock or 231mm?
The 199mm to stock. The surface area of the pads isn't much more than the stock 4Runner pads. The difference though of the thicker rotor will help with the common warping issue. Going to 231mm increases the surface area of the pads dramatically allowing for shorter stopping distances and helps when towing.
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Old 05-21-2021, 12:16 PM #15
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Quote:
Originally Posted by gamefreakgc View Post
The 199mm to stock. The surface area of the pads isn't much more than the stock 4Runner pads. The difference though of the thicker rotor will help with the common warping issue. Going to 231mm increases the surface area of the pads dramatically allowing for shorter stopping distances and helps when towing.
I disagree. The 231 brake pad backing plate is bigger than 199 brake pad backing plate, but the brake pad material is very close to the same size between 231 and 199 (at least for OEM pads). You can see the two side by side in this post: https://www.toyota-4runner.org/3378920-post1.html The 199 and 231 brake calipers both have the same size pistons. I do think the larger rotors are the biggest advantage to either upgrade.

Side rant: A lot of people complain about a softer pedal, but that's just how hydraulic systems and fluid dynamics function. When you increase the brake caliper piston size you increase the amount of fluid required to move the piston out the same distance as the smaller OEM caliper piston which is why people complain of a softer/lower pedal. In order to keep the same pedal feel/distance you would need to increase the master cylinder piston bore proportionally to the brake caliper piston increase.
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