Warped rotors?

I have a 2024 crew cab sport with 20 in rims. Last summer I noticed a vibration while braking, only while braking. When I switched to my 18 in winter rims with LT tires the vibration completely disappeared. Now that I’ve switched back to the 20 in rims with summer tires the vibration is back.

I had assumed that the rotors were warped, but now I’m not sure. The 18 in rims are the silver Toyota rims that come std in the SR5. Is it possible that it’s NOT the rotors? or somehow that the taller side wall on the 18in tires is absorbing the rotor vibration so that I can’t feel it? If it’s warped rotors then why can’t I feel it with the 18in wheels?

 

It seems that it isnt your rotors judging from your post.
Although I dont see what else it could be.
Obviously if it were out of balance tires it would show up all the time.
Were the tires the same one's on your rims that caused the shake?

 

It’s the shitty rotors I’ve been going back and forth at the dealer and called corporate about it . Started at 8k miles under hard braking over 60 mph and when the brakes get hot . They finally replaced the rotors and now the issue is resolved

 

You can rule out warped rotors by checking the runout of each rotor. A runout gauge runs about $60 and is especially worth it if you work on multiple vehicles. If the truck is still under warranty, you can try submitting a warranty claim. Some dealers may not fix it under warranty however, claiming the brake rotor is a wear item.

 

I have read a couple of articles about warped rotors. Sometimes what people consider a warped rotor is actually that the pads/rotors weren't bedding in correctly and it leaves high spot causing the issue. Now tundra rotors are know to be pretty shitty, but it seems your issue might be your rims and tires.