Brake issue
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Joined: Feb 2024
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From: CA
Looking at the pictures and what you describe, I have personal doubts about what is being said is the problem. Having tooled 50 years on cars, with a number of them as a senior Porsche/Audi master tech, I've changed more than a few brake rotors out. The rear brakes are not the main braking surfaces. To feel a vibration from the rear rotors there would have to be more noticeable irregularities on those rears to have you feel it in the pedal as you do. I would pull the front wheels and spin the front rotors and check for out of round or other problems using a micrometer. I think you may find the problem may be there instead.
Lexus Test Driver
Joined: Aug 2003
Posts: 7,661
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From: Florida
Would OP feel a sensation at the pedal for a brake by wire system? OP mentioned he felt a throbbing sensation while braking but did not specify where. I wonder if he means he feels the entire car may be shaking. It must quite the runout (front or rear rotors) if that were the case.
Thread Starter
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I dont shampoo the barrels on my wheels either. As long as the car's paint, glass, and wheel faces are clean I am happy.
Would OP feel a sensation at the pedal for a brake by wire system? OP mentioned he felt a throbbing sensation while braking but did not specify where. I wonder if he means he feels the entire car may be shaking. It must quite the runout (front or rear rotors) if that were the case.
Looking at the pictures and what you describe, I have personal doubts about what is being said is the problem. Having tooled 50 years on cars, with a number of them as a senior Porsche/Audi master tech, I've changed more than a few brake rotors out. The rear brakes are not the main braking surfaces. To feel a vibration from the rear rotors there would have to be more noticeable irregularities on those rears to have you feel it in the pedal as you do. I would pull the front wheels and spin the front rotors and check for out of round or other problems using a micrometer. I think you may find the problem may be there instead.
Last edited by Korbek; Mar 25, 2026 at 11:17 AM.
Pole Position
Joined: Feb 2012
Posts: 2,185
Likes: 944
From: MA
Looking at the pictures and what you describe, I have personal doubts about what is being said is the problem. Having tooled 50 years on cars, with a number of them as a senior Porsche/Audi master tech, I've changed more than a few brake rotors out. The rear brakes are not the main braking surfaces. To feel a vibration from the rear rotors there would have to be more noticeable irregularities on those rears to have you feel it in the pedal as you do. I would pull the front wheels and spin the front rotors and check for out of round or other problems using a micrometer. I think you may find the problem may be there instead.
Thread Starter
Intermediate
Joined: May 2024
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Lexus authorized rear rotor replacement.
I did try recommending the dealer take the front rotors off and check for out of round as mentioned above before replacing rears, but they seem convinced the pulse/shake is from the pad skipping across that dark spot on the rear rotors. I guess we'll see.
If rear rotors dont fix it testing fronts with a micrometer will be the next step I imagine. At least its still driveable and enjoyable in the mean time, so I'm not too fussed about it.
I did try recommending the dealer take the front rotors off and check for out of round as mentioned above before replacing rears, but they seem convinced the pulse/shake is from the pad skipping across that dark spot on the rear rotors. I guess we'll see.
If rear rotors dont fix it testing fronts with a micrometer will be the next step I imagine. At least its still driveable and enjoyable in the mean time, so I'm not too fussed about it.
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Joined: Apr 2025
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From: TN
Upon delivery of mine the tech and I setup many preferences. One was automictic parking set at power off. After your experience I attempted to turn this off without success. Realized never set PB on past cars except when on an incline so I could get out of Park to Drive. Next service we'll correct this.
Thread Starter
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Joined: May 2024
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I agree. And whats crazier is if new rears DOESNT fix it, I'm sure they'll also replace the fronts if they're out of round. I imagine maybe the dealer will take a hit for not doing full measurements of all 4 first, maybe lower reimbursemenr from Lexus? But I'm confident Lexus will make sure whatever this is gets resolved.
I can say with 100% certainty my experience would NOT have been as good with GM had issues arisen with wear items this early in my now-sold C8's lifespan.
American cars' build quality has definitely risen a LOT over the decades and competes well with foreign luxury brands on our higher end cars, but the after-purchase experience is still severely lacking comparatively.
I do however hope its as simple as these patches on the rears and chasing it down doesnt take a long time and multiple trips to the dealer.
I can say with 100% certainty my experience would NOT have been as good with GM had issues arisen with wear items this early in my now-sold C8's lifespan.
American cars' build quality has definitely risen a LOT over the decades and competes well with foreign luxury brands on our higher end cars, but the after-purchase experience is still severely lacking comparatively.
I do however hope its as simple as these patches on the rears and chasing it down doesnt take a long time and multiple trips to the dealer.
Last edited by Korbek; Mar 28, 2026 at 05:56 AM.
Upon delivery of mine the tech and I setup many preferences. One was automictic parking set at power off. After your experience I attempted to turn this off without success. Realized never set PB on past cars except when on an incline so I could get out of Park to Drive. Next service we'll correct this.
I always set the parking brake when I power off any vehicle I drive. It's much easier on the Transmission parking pawl and is another safety step IMHO.Lou
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Joined: Apr 2025
Posts: 591
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From: TN
Fair question. It was Korbek's experience with his rotors damage. New to the modern systems. Previously could apply PB pressure via pulling a handle, pedal push later, console lever after that to the amount judged appropriate to circumstances. Always trusted Lexus design specs. Began to to question amount of pressure applied in auto. Edit: it's a tactile thing perhaps
Last edited by ratchettt; Mar 28, 2026 at 02:28 PM.
Thread Starter
Intermediate
Joined: May 2024
Posts: 425
Likes: 424
Fair question. It was Korbek's experience with his rotors damage. New to the modern systems. Previously could apply PB pressure via pulling a handle, pedal push later, console lever after that to the amount judged appropriate to circumstances. Always trusted Lexus design specs. Began to to question amount of pressure applied in auto. Edit: it's a tactile thing perhaps