Uneven Coloring on Brake Rotors - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Spairo · 08-30-2022, 09:34 PM

After my last track day, when I swapped out my track pads, I noticed that the front rotors had a distinct color band on them.

Does anyone have any thoughts on what this may indicate?

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soundman98 · 08-30-2022, 11:56 PM

looks like you've got the wrong front rotors and calipers.

but mad props for getting those installed for a square braking setup.

Spairo · 08-31-2022, 07:09 AM

HA. I forgot that I took pics of the rears. When i had the fronts off, I didn't think to take pics. When I found similar discoloring on the rear, I took some pics.

I guess at my age, I shouldn't wait a week to finally post a question.

Here is a pic of the front that I did take after the wheel was back on.

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NoHaveMSG · 08-31-2022, 10:22 AM

It's uneven transfer layer. Don't know why though.

Spairo · 08-31-2022, 12:41 PM

So an uneven transfer layer was one of my suspicions. What I do not know is what would affect the transfer layer and thus cause it to be uneven. One obvious (but not necessarily correct) suspicion would be that I am getting uneven brake pressure across the rotor. Any thoughts on what would cause that? I am going to put a straight edge on the rotors to make sure that they are flat. However, this pattern shows up on all 4 rotors and 4 un-flat (new word by me) rotors seems unlikely.

Thanks for any input.

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CSG Mike · 08-31-2022, 01:39 PM

New pads on used rotors? Totally viable.

You ideally want new rotors with new pads, unless you know your rotors are flat.

Spairo · 08-31-2022, 03:34 PM

Currently, I am leaving the rotors on the car and swapping the pads between my track pads and my street pads.

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Tokay444 · 08-31-2022, 04:04 PM

Quote:

Originally Posted by Spairo

Currently, I am leaving the rotors on the car and swapping the pads between my track pads and my street pads.

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Did you ask anyone if the pad materials were compatible with each other?

Spairo · 08-31-2022, 08:42 PM

That I did not. I had not even considered that as a possible issue.

Is that a thing???

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ZionsWrath · 08-31-2022, 11:54 PM

I got better wear when I started doing pedal dance.

andys_garage · 09-01-2022, 12:55 PM

I saw something similar when i bedded my track pads on the stock rear rotors (thanks tirerack - though they did do right just not in time). It was only on the one where i couldn't fit a shim between the pad and the caliper. Sanding the pad a little and installing a shim fixed it.

andys_garage · 09-01-2022, 12:58 PM

Quote:

Originally Posted by Spairo

That I did not. I had not even considered that as a possible issue.

Is that a thing???

AP racing posted a video of how to clean old material off then bed new on.

basically a few stops from 50-5 mph should get them hot enough to burn off the old material, then repeat the normal bedding process

NoHaveMSG · 09-01-2022, 03:10 PM

I don’t think I would worry about it. My car looks about the same and the rotors have only had the same pads on them their entire life.

Sapphireho · 09-01-2022, 04:08 PM

I always went by more how they worked. If working great, I don't care how they look.

08-30-2022, 09:34 PM	#1
Spairo Member Join Date: Dec 2016 Drives: 2013 FR-S 6 spd in Halo Location: San Diego Posts: 81 Thanks: 10 Thanked 69 Times in 34 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Uneven Coloring on Brake Rotors After my last track day, when I swapped out my track pads, I noticed that the front rotors had a distinct color band on them. Does anyone have any thoughts on what this may indicate? Sent from my SM-G950U using Tapatalk

08-30-2022, 11:56 PM	#2
soundman98 ProCrastinationConsultant Join Date: Sep 2013 Drives: '14 Ranger, '18 Tacoma 4Dr LB Location: chicago-ish Posts: 11,330 Thanks: 35,240 Thanked 13,673 Times in 6,781 Posts Mentioned: 98 Post(s) Tagged: 0 Thread(s)	looks like you've got the wrong front rotors and calipers. but mad props for getting those installed for a square braking setup. __________________ "The time you enjoy wasting is not wasted time"

08-31-2022, 11:54 PM	#10
ZionsWrath Thanks Join Date: Apr 2013 Drives: BRZ Location: NY Posts: 4,163 Thanks: 5,989 Thanked 3,100 Times in 1,498 Posts Mentioned: 38 Post(s) Tagged: 3 Thread(s)	I got better wear when I started doing pedal dance. __________________

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08-31-2022, 07:09 AM	#3
Spairo Member Join Date: Dec 2016 Drives: 2013 FR-S 6 spd in Halo Location: San Diego Posts: 81 Thanks: 10 Thanked 69 Times in 34 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	HA. I forgot that I took pics of the rears. When i had the fronts off, I didn't think to take pics. When I found similar discoloring on the rear, I took some pics. I guess at my age, I shouldn't wait a week to finally post a question. Here is a pic of the front that I did take after the wheel was back on. Sent from my SM-G950U using Tapatalk

08-31-2022, 12:41 PM	#5
Spairo Member Join Date: Dec 2016 Drives: 2013 FR-S 6 spd in Halo Location: San Diego Posts: 81 Thanks: 10 Thanked 69 Times in 34 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	So an uneven transfer layer was one of my suspicions. What I do not know is what would affect the transfer layer and thus cause it to be uneven. One obvious (but not necessarily correct) suspicion would be that I am getting uneven brake pressure across the rotor. Any thoughts on what would cause that? I am going to put a straight edge on the rotors to make sure that they are flat. However, this pattern shows up on all 4 rotors and 4 un-flat (new word by me) rotors seems unlikely. Thanks for any input. Sent from my SM-G950U using Tapatalk

08-31-2022, 01:39 PM	#6
CSG Mike Join Date: Jul 2012 Drives: S2000 CR Location: Orange County Posts: 14,530 Thanks: 8,920 Thanked 14,177 Times in 6,835 Posts Mentioned: 966 Post(s) Tagged: 14 Thread(s)	New pads on used rotors? Totally viable. You ideally want new rotors with new pads, unless you know your rotors are flat.

08-31-2022, 03:34 PM	#7
Spairo Member Join Date: Dec 2016 Drives: 2013 FR-S 6 spd in Halo Location: San Diego Posts: 81 Thanks: 10 Thanked 69 Times in 34 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Currently, I am leaving the rotors on the car and swapping the pads between my track pads and my street pads. Sent from my SM-G950U using Tapatalk

08-31-2022, 08:42 PM	#9
Spairo Member Join Date: Dec 2016 Drives: 2013 FR-S 6 spd in Halo Location: San Diego Posts: 81 Thanks: 10 Thanked 69 Times in 34 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	That I did not. I had not even considered that as a possible issue. Is that a thing??? Sent from my SM-G950U using Tapatalk

09-01-2022, 12:55 PM	#11
andys_garage Member Join Date: May 2022 Drives: 2022 GR86 Premium Track bRed Location: Ohio Posts: 63 Thanks: 16 Thanked 40 Times in 24 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I saw something similar when i bedded my track pads on the stock rear rotors (thanks tirerack - though they did do right just not in time). It was only on the one where i couldn't fit a shim between the pad and the caliper. Sanding the pad a little and installing a shim fixed it.

09-01-2022, 04:08 PM	#14
Sapphireho ¯\_(ツ)_/¯ Join Date: Mar 2016 Drives: '15 ultramarine Location: Idaho Posts: 13,192 Thanks: 5,451 Thanked 18,240 Times in 8,609 Posts Mentioned: 155 Post(s) Tagged: 0 Thread(s)	I always went by more how they worked. If working great, I don't care how they look.

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