05-08-2021, 05:33 PM | #1 |
Drives: 2018 Hyper Blue Camaro 1SS 1LE Join Date: Feb 2019
Location: Kokomo, IN
Posts: 79
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Bad Vibration While Braking Hard
So I did a track day in the rain and cold this past Thursday at Gingerman, and I noticed on my last session out that the two turns after the straightaways my car would vibrate like crazy. Everything was fine during the 2 previous 30 minute sessions. Car has 48,500 miles on original rotors and I had a new set of powerstop track pads and Supercar3 tires. After getting home and getting the wheels off I noticed this dotted line around the rotor. I assume these are pad deposits, and if that’s the case how do I fix this and prevent it from happening the next time I go?
Here’s the pictures of the front and rear rotors: This wasn’t my first track day with the car but I previously used the OEM pads and didn’t have this problem. It was also raining and cold and I wasn’t going as fast as if it would’ve been warm and dry. |
05-08-2021, 06:10 PM | #2 |
Drives: 2019 ZL1 1LE Join Date: Sep 2010
Location: Bastrop, TX
Posts: 438
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Did you bed the pads after installing them? It looks like they started to get warm enough to begin material transfer, but didn't quite get there.
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05-08-2021, 06:17 PM | #3 |
Drives: 2018 Hyper Blue Camaro 1SS 1LE Join Date: Feb 2019
Location: Kokomo, IN
Posts: 79
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Yeah I bed them in the day before. Does that mean that maybe a couple more laps around and it would’ve taken care of itself? It wasn’t very confidence inspiring and the track was super slick so I just called it a day after I started feeling the vibration. Also could’ve been the track finally starting to dry off a little by then as well I suppose.
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05-09-2021, 09:01 AM | #4 |
Drives: 2022 1SS 1LE A10 BCD WCT+PDR Join Date: Mar 2008
Location: Johnstown, PA
Posts: 3,200
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I've seen this happen with the Powerstop Track pads. Do you use any of the nannies? If so they use the rear brakes to settle the car down. This can cause overheating of the rear brakes. Also, do you do enough of a cool down lap after the session is over? Some events don't give adequate cool down time. If this is the case, drive around the pit area or if you can a nearby road where you can get more cooling to bring the hot lap temps down.
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05-09-2021, 09:13 AM | #5 |
Drives: 2017 SS 1LE Join Date: Mar 2017
Location: Florida
Posts: 617
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Ditto above and I gave up and got aggressive pads and it all went away. GM is a bit nuts on the bedding procedure, there is no way you could do it unless you lived by empty country roads...
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05-09-2021, 09:38 AM | #6 |
Drives: 2018 Hyper Blue Camaro 1SS 1LE Join Date: Feb 2019
Location: Kokomo, IN
Posts: 79
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Yeah I started the day in PTM Wet, but quickly didn’t like just how much it cut power and stop the car from sliding even a little bit and switched to PTM Sport1 and eventually Sport2. The problem though, was that I could feel it in the front too. I still did a cool down lap, but it was 45 degrees and raining steadily throughout the day. The next time I go, I’m going to use the same pads again and only go when it’s dry and a little warmer out to see if it happens again. It’s sounding like I maybe didn’t bed them well enough? I doubt I was overheating them though because my best lap around Gingerman was 2:19 LOL
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05-09-2021, 10:47 AM | #7 | |
Drives: 2019 Camaro Z-28 Join Date: Jul 2010
Location: Dallas
Posts: 1,482
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brake issues
Quote:
I changed them out with HAWK 5.0 PADS thinking this would be an improvement and while the initial BITE was a little better they did have some slight fading issues so when the time comes I will be going back to OEM original pads.
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05-09-2021, 05:25 PM | #8 |
Drives: 2018 ZL1 1LE Join Date: May 2019
Location: South Florida
Posts: 438
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What pads exactly? Are these the z26 powerstops? Because they are NOT track pads.
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05-09-2021, 06:16 PM | #9 |
Drives: 2018 Hyper Blue Camaro 1SS 1LE Join Date: Feb 2019
Location: Kokomo, IN
Posts: 79
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These are the powerstop track day pads. I use the Z26 for daily driving, but swapped to these for the track day.
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05-09-2021, 06:18 PM | #10 | |
Drives: 2018 Hyper Blue Camaro 1SS 1LE Join Date: Feb 2019
Location: Kokomo, IN
Posts: 79
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Quote:
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05-16-2021, 04:17 PM | #11 |
Drives: 2019 Camaro Z-28 Join Date: Jul 2010
Location: Dallas
Posts: 1,482
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A little more of an update. I ran my SECOND track day with these HAWK STREET 5.0 pads and it confirmed to me that they DEFINITELY do have some fading when hot. We were running 25 minute track sessions at EAGLES CANYON RACEWAY which has 15 turns in it and a 1/2 mile straightway and I noticed some degree of fad towards the last 5 minutes of the session. It was predictable but of course but not desirable compared to STOCK pads.
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2019 SS 1LE BIG NA A10 Eagles Canyon Raceway 2.7 CCW Below https://youtu.be/c9M5UHDftcA 4-15-23 at SCCA TT U1 Class MEGA Thread on THIS car: https://www.camaro6.com/forums/showthread.php?t=602092 Retired Cars BELOW: 1973 Camaro, 1969 Camaro, 1969 Camaro SS RS 2010 Camaro SS with 1000HP F1R, 2019 ZL1 1LE A10 |
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