Shaking/vibration when braking

[Slowmk5]

Okay first off thank you for the add! I’ve searched and had no luck finding anything… that being said
I have a 2021 Supra with 8k miles and has a bad shake/vibration in the chassis around 30-36 mph when braking. I’ve had brake recall done rotors/brakes changed and still there. Also car won’t allow me to fully rev out 1st or 2nd gear will only allow down shift to 2nd if under 20mph (not sure if it’s related but started around the same time. Car isn’t beat on or tracked. Any help is appreciated, dealer keeps running me in circles….

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[Thraxbert]

Dealer needs to test the runout of the rotor and the runout of the wheel hub behind the rotor. Oftentimes if there is still shuddering during braking after rotor/pad change, the wheel hub itself is deformed.

I don't think Toyota provides hub/rotor runout specs in the shop manual, but 0.001" runout (or less) on a hub is advisable, and 0.002" to 0.050" for the rotor is advisable.

Ask them to check and report the runout values on these components.

 

[Slowmk5]

Dealer needs to test the runout of the rotor and the runout of the wheel hub behind the rotor. Oftentimes if there is still shuddering during braking after rotor/pad change, the wheel hub itself is deformed.

I don't think Toyota provides hub/rotor runout specs in the shop manual, but 0.001" runout (or less) on a hub is advisable, and 0.002" to 0.050" for the rotor is advisable.

Ask them to check and report the runout values on these components.

Dealer needs to test the runout of the rotor and the runout of the wheel hub behind the rotor. Oftentimes if there is still shuddering during braking after rotor/pad change, the wheel hub itself is deformed.

I don't think Toyota provides hub/rotor runout specs in the shop manual, but 0.001" runout (or less) on a hub is advisable, and 0.002" to 0.050" for the rotor is advisable.

Ask them to check and report the runout values on these components.

I have appointment this Friday I’ll see what they say will be my 3rd time back??‍. Any idea what would be causing the car to not let me drive out 1st or 2nd?

 

[Thraxbert]

I have appointment this Friday I’ll see what they say will be my 3rd time back??‍. Any idea what would be causing the car to not let me drive out 1st or 2nd?

Are your 1<->2 shifting issues true even in sport+manual mode?

 

[Slowmk5]

Are your 1<->2 shifting issues true even in sport+manual mode?

Yes doesn’t matter what mode it’s in

 

[Thraxbert]

Yes doesn’t matter what mode it’s in

Does the car alert you to any codes on the screen when you start it up? Are you able to scan for codes yourself with a tool like Bimmerlink? Certainly you should be able to take any gear to red line, at which point the car will auto-shift. Note that shift RPMs may be limited until the transmission and oil reaches a certain temperature.

 

[Slowmk5]

Does the car alert you to any codes on the screen when you start it up? Are you able to scan for codes yourself with a tool like Bimmerlink? Certainly you should be able to take any gear to red line, at which point the car will auto-shift. Note that shift RPMs may be limited until the transmission and oil reaches a certain temperature.

It shows ( cont. driving possible:chassis stabilization)

 

[Thraxbert]

It shows ( cont. driving possible:chassis stabilization)

I bet you one or more of the chassis height sensor brackets are broken. There's one front left and back right. I'm pretty astonished they let you take the car back with this error on the display. The front left height sensor is pointed in red, and the one on the rear looks similar. It's just a cheapo plastic piece that snaps onto the suspension arm (green). This will limit the car's behavior for safety, because it isn't sure if the suspension is messed up.

Are you the first owner of the vehicle? The possibility of a broken height sensor and a warped wheel hub makes me think this car was in some sort of impact, perhaps wheel on a curb or a nasty pot hole.

 

[razorlab]

I bet you one or more of the chassis height sensor brackets are broken. There's one front left and back right.

Huh? they are both drivers side (USDM).

 

[Thraxbert]

Huh? they are both drivers side (USDM).

You got me. I was just going from memory.

 

[Slowmk5]

I bet you one or more of the chassis height sensor brackets are broken. There's one front left and back right. I'm pretty astonished they let you take the car back with this error on the display. The front left height sensor is pointed in red, and the one on the rear looks similar. It's just a cheapo plastic piece that snaps onto the suspension arm (green). This will limit the car's behavior for safety, because it isn't sure if the suspension is messed up.

Are you the first owner of the vehicle? The possibility of a broken height sensor and a warped wheel hub makes me think this car was in some sort of impact, perhaps wheel on a curb or a nasty pot hole.

Neither are broke and both intact, and no wrecks,curbs or pot holes hit. Is there any way to reset it without having a dealer do it?

Okay first off thank you for the add! I’ve searched and had no luck finding anything… that being said
I have a 2021 Supra with 8k miles and has a bad shake/vibration in the chassis around 30-36 mph when braking. I’ve had brake recall done rotors/brakes changed and still there. Also car won’t allow me to fully rev out 1st or 2nd gear will only allow down shift to 2nd if under 20mph (not sure if it’s related but started around the same time. Car isn’t beat on or tracked. Any help is appreciated, dealer keeps running me in circles….

***** fixed*****
Did some digging on my own (dealer couldn’t seem to find it, super simple fix, ended up being lose caliper bracket bolt backed out, now gotta figure out the shifting problem

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