Rotor runout question

[Brybo86]

Lexus es350
Getting significant vibrations only when braking.
This is my minand max values so if I'm reading this right I'm at 0.003in of rotor runout?
Is this bad enough to cause bad vibes?
Same runout on both driver and passenger side front wheels.

Should I also remove rotors to check hub runout?

 

[Rust_Belt_Pete]

Check the hub runout and see if "rotating" the rotors does anything. Tolerances stack, so if you turn it 180 it may get better.

 

[The Critic]

Runout causes the DTV. DTV causes the vibration. This is why pedal pulsation generally shows up to 5-15K after the brake service, not during the test drive.

.003" isn't great, really need to be under .0015" for maximum longevity IMO.

 

[Brybo86]

Ok making progress i got the passenger side to approx 0.0005in
Half of one of the spaces on gauge.
Cleaned off some corrosion between rotor and hub.

 

[The Critic]

Ok making progress i got the passenger side to approx 0.0005in
Half of one of the spaces on gauge.
Cleaned off some corrosion between rotor and hub.
View attachment 280104
View attachment 280105

At this point it doesn’t matter. Even if you reduce the runout, the DTV is already present.

 

[Rust_Belt_Pete]

What is DTV?

 

[Brybo86]

Drivers side best we could get was .0012
A fuzz bigger than 1 tick on the gauge.

Test drive and vibration is definitely still there, maybe slightly better but that is likely just me trying to justify my time spent messing with it.

 

[brages]

What is DTV?

Disc Thickness Variation

 

[Brybo86]

Disc Thickness Variation

The inside portion of disc on driver side is noticeably thinner than the outboard disc.
The lower slide pin was basically seized.
Probably should just get some new rotors and pads.

 

[The Critic]

The lower slide pin was basically seized.

Need to order two bushings, part #47769-50010. They're likely swollen.

 

[Brybo86]

Need to order two bushings, part #47769-50010. They're likely swollen.

Yes the little rubber bushing on the lower slide pin?
They had disintegrated. I replaced them.
And new lower pins.