I'm just replacing my front rotors on my 97 4runner. My truck orginally came with the stock 15" wheels. I see there are 2 different size rotors available, ones with 16" wheels and ones without 16" wheels. I'm assuming the ones for 16" wheels should be a bit better so would those fit on my truck without any problems? I now have a 265/70/17 wheel and tire on my 4runner now. Any help would be great. And I know everyone will say upgrade to Tundra brakes but don't see the need for my type of driving. I already have pretty new oem brake pads on already. Thanks.
Stock rotors for 15" and 16" wheels
- Thread starter hdoggie24
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jgue467
Senior Member
The larger rotors (319mm) for the 16" wheel would require the correct calipers/pads, other than that should fit.
Going with a good caliper/rotor like say Stop Tech for example designed for 'medium' duty will yield rotors with slots allowing for better cooling (the real reason folks do the tbu) on mountain passes and repeated stop/go situations. Luck. :cowboy:
Going with a good caliper/rotor like say Stop Tech for example designed for 'medium' duty will yield rotors with slots allowing for better cooling (the real reason folks do the tbu) on mountain passes and repeated stop/go situations. Luck. :cowboy:
AntleredRuin
New member
+1 on this. You'll need new calipers to fit the larger rotors. So if you're replacing the calipers, yeah do the TBU. You're replacing all the parts anyways to upgrade, might as well REALLY upgrade.
I doubt it would cost any extra (Maybe a couple bucks) over the new calipers for a 16" wheel. Just make sure you get the 199mm calipers, not the 231mm, unless you feel like buying either new wheels, slightly grinding your current ones, or getting wheel spacers. 231mm won't fit on stock 15" wheels.
I didn't really need the TBU either, based on my driving/braking habits, but DAMN was it worth it. I found two '05 Sequioa 231mm calipers and rotors with plenty of meat left on them at a junkyard for $80 out the door. I already needed new rotors anyways, so I jumped on them. Just got new pads, and the braking is amazing.
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phattyduck
Elite Member
The rear wheel cylinders for the rear brakes are also bigger on the 16" wheel trucks. Upgrade those at the same time to keep balanced braking. Otherwise, the components in the rear are the same (drums/shoes/hardware).
The larger wheel/tire assembly will definitely affect your braking. It isn't that they are heavier, it is that they are a larger rolling diameter, which reduces ratio of force the brakes can apply to the ground.
-Charlie
The larger wheel/tire assembly will definitely affect your braking. It isn't that they are heavier, it is that they are a larger rolling diameter, which reduces ratio of force the brakes can apply to the ground.
-Charlie
AntleredRuin
New member
I'm not sure of all the technical aspects of brake balancing, but I know that plenty of people with 15" wheels have done the TBU without upgrading the rear brakes at all. To my knowledge, any 'issues' reported have been resolved simply by bleeding the brakes properly afterwards.
If you do the 199mm calipers, you will have better brakes than stock T4R, but they won't be as good as the 231mm calipers, which may lead to balance issues.
Early year 1st gen Tundras (and maybe Sequoias) came with the 199mm, but a few years in, there was a recall and Toyota replaced the 199mm with the 231mm, due to the 199mm being a bit too underpowered for the Tundras. I think the Tundras came stock with the 231mm starting in '04 or '05.
Both the 199mm and the 231mm are bigger than the stock 3rd gen calipers, so both are an improvement.
phattyduck
Elite Member
Upgrading the rear brakes isn't 100% needed... but you will be bleeding the brakes already and even new OEM wheel cylinders aren't very expensive. The more braking power you can spread the the rear, the easier it will be for the fronts to do their job and the better (overall) your brakes will feel.
-Charlie
-Charlie
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