Uneven brake temps and warping after a light track day - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

imprezive · 04-17-2022, 01:26 AM

I brought a laser temp gun to a track day for the first time. It was an SCCA "Track Night", so it was only three 20 minute sessions.

The first two sessions my rotor temps were still fairly low (about 250). As I was getting more comfortable for the last session I went a lot more aggressive. There was a large variation from L to R temperature was about 650 on the L and 450 on the R. The track does have more right handers under braking, but that still seems like a pretty large difference between left and right?!

Another strange phenomenon occurred. Prior to the event my rotors were warped. Pretty bad vibration. I had them resurfaced once already and it didn't help for long, so I figured I'd abuse them and replace them after the event. Somehow the vibration almost complete vanished after the event. Did I somehow un-warp them?

soundman98 · 04-17-2022, 01:36 AM

Quote:

Originally Posted by imprezive

I brought a laser temp gun to a track day for the first time. It was an SCCA "Track Night", so it was only three 20 minute sessions.

The first two sessions my rotor temps were still fairly low (about 250). As I was getting more comfortable for the last session I went a lot more aggressive. There was a large variation from L to R temperature was about 650 on the L and 450 on the R. The track does have more right handers under braking, but that still seems like a pretty large difference between left and right?!

makes perfect sense if you didn't pull the ABS fuse or do the pedal dance.

TCS was interceding on your behalf to keep the car oriented.

Quote:

Another strange phenomenon occurred. Prior to the event my rotors were warped. Pretty bad vibration. I had them resurfaced once already and it didn't help for long, so I figured I'd abuse them and replace them after the event. Somehow the vibration almost complete vanished after the event. Did I somehow un-warp them?

rotors don't warp.

https://alconkits.com/technical-info...ed-brake-discs

imprezive · 04-17-2022, 01:45 AM

Quote:

Originally Posted by soundman98

makes perfect sense if you didn't pull the ABS fuse or do the pedal dance.

TCS was interceding on your behalf to keep the car oriented.

I believe I had all traction control turned off. For the 2017+ it's just the long hold button push, right? Pedal dance is for the previous years, IIRC.

I did not disable ABS, but only felt it engage once or twice very briefly.

Quote:

Originally Posted by soundman98

rotors don't warp.

https://alconkits.com/technical-info...ed-brake-discs

Learn something new every day. Makes sense now. Thanks!

soundman98 · 04-17-2022, 02:31 AM

i believe the only change from '17+ was a less intrusive track mode. i believe press-hold still is the same, where tcs is still active, just the least intrusive mode.

gen3v8 · 04-17-2022, 06:11 AM

I run my 2017 long press. No probs very minimal intrusion. No brake overheats unless by ME. May I add I get around my local Track fairly Fast but only in comparison to other drivers. Then again ABS is not my concern, Nannies stopping me from getting on the gas are !.

ZDan · 04-17-2022, 09:30 AM

Quote:

Originally Posted by soundman98

i believe the only change from '17+ was a less intrusive track mode. i believe press-hold still is the same, where tcs is still active, just the least intrusive mode.

For sure on '17+ the "long hold" completely turns off traction control. Pretty sure it disables everything but ABS. I could not tell any difference between the long hold and the pedal dance on my '17 PP.

https://practicalmotoring.com.au/car...baru-brz-work/

soundman98 · 04-17-2022, 10:51 AM

Quote:

Originally Posted by Captain Snooze

Warped disc fallacy debunked

some days, i feel like i don't even exist

ZDan · 04-17-2022, 11:02 AM

Quote:

Originally Posted by soundman98

some days, i feel like i don't even exist

Ah, but that's were you're wrong!

"Life itself is only a vision, a dream. Nothing exists save empty space - and you! And you are but a thought." - Satan

Captain Snooze · 04-17-2022, 06:22 PM

Quote:

Originally Posted by soundman98

some days, i feel like i don't even exist

I read this post and scratched my head. Huh? I don't understand. I went back and reread your first post in this thread then spotted the link. It was quite well camouflaged and it wasn't surprising I didn't see it on my first read through. Admittedly, I cringed a little when I spotted the link.
My apologies.

murdoc · 04-17-2022, 10:13 PM

I notice I've been sitting in traffic too often when I start to get brake judder. "Spirited" driving usually fixes it.

jflogerzi · 04-21-2022, 01:21 AM

Its more of un-even pad deposit on the face of the rotor vs wrapped rotors. And Chances you "bedded" your brakes while on track which got rid of the even pad deposits.

04-17-2022, 01:26 AM	#1
imprezive Senior Member Join Date: Apr 2019 Drives: 2017 BRZ - WRB - PP Location: FL Posts: 116 Thanks: 75 Thanked 47 Times in 25 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Uneven brake temps and warping after a light track day I brought a laser temp gun to a track day for the first time. It was an SCCA "Track Night", so it was only three 20 minute sessions. The first two sessions my rotor temps were still fairly low (about 250). As I was getting more comfortable for the last session I went a lot more aggressive. There was a large variation from L to R temperature was about 650 on the L and 450 on the R. The track does have more right handers under braking, but that still seems like a pretty large difference between left and right?! Another strange phenomenon occurred. Prior to the event my rotors were warped. Pretty bad vibration. I had them resurfaced once already and it didn't help for long, so I figured I'd abuse them and replace them after the event. Somehow the vibration almost complete vanished after the event. Did I somehow un-warp them? Last edited by imprezive; 04-18-2022 at 12:06 AM. Reason: Trying to direct more focus towards the uneven brake temps

04-17-2022, 02:31 AM	#4
soundman98 ProCrastinationConsultant Join Date: Sep 2013 Drives: '14 Ranger, '18 Tacoma 4Dr LB Location: chicago-ish Posts: 11,330 Thanks: 35,240 Thanked 13,675 Times in 6,782 Posts Mentioned: 98 Post(s) Tagged: 0 Thread(s)	i believe the only change from '17+ was a less intrusive track mode. i believe press-hold still is the same, where tcs is still active, just the least intrusive mode. __________________ "The time you enjoy wasting is not wasted time"

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04-17-2022, 06:11 AM	#5
gen3v8 30 minute maintenance Join Date: Oct 2020 Drives: My18 wrxsti Location: Botany Bay Posts: 1,178 Thanks: 769 Thanked 1,236 Times in 631 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	I run my 2017 long press. No probs very minimal intrusion. No brake overheats unless by ME. May I add I get around my local Track fairly Fast but only in comparison to other drivers. Then again ABS is not my concern, Nannies stopping me from getting on the gas are !.

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