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