07-28-2022, 12:09 AM | #1 |
Rear brake vibration when bakes are hot.
I have had an odd problem pop up on my last track day.
After about 3-5 hot laps, the car starts to shake under braking. The harder I push the car into the braking zone, the worse the vibration gets. I know its coming from the rear brakes. Nothing comes through to the steering wheel. The rear pads were recently changed from ECS Yellows to HAWK HP Sport pads just a week prior to the track day. Yes, defiantly feels like warped rotors, but they were fine just a couple weeks prior to the pad change. Plus, in the time the car cools down between heats, it goes away until I put 3-5 laps on it on the next heat. Anyone experience this? Don't want to waste too much time figuring this out before the next event. Thank you!
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2013 1SS/1LE
Corsa Extreme cat-back, Speed Engineering LT Headers with black ceramic coating, C7 Z06 Front Brake Upgrade, Mishimoto Oil Cooler, BMR Tunnel Brace, Mishimoto Oil Catch Can, MSD Plug Wires, Mishimoto Radiator and Hoses. |
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07-28-2022, 07:44 AM | #2 |
Drives: 2014 2SS/RS 6SP Ashen Grey Join Date: Aug 2021
Location: NY
Posts: 1,252
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If it were me I think I would replace the rear rotors, I have never been a fan of changing pad compounds with out at minimum cleaning the rotor surface up with a light cut, ( I am not a fan of cutting rotors anymore so if I change compound I change rotors as well ).
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GM 3.91/TrueTrac OEM ZL1 Rims, Brakes & Side Skirts.ACST4 Splitter/Deflectors NPP M2W,GM Short Throw,Remote Clutch reservoir
GPI Ported Rod Mod,BO White PTB,CAI/JRE Scoop, Moroso Catch Can GC Aluminum DS Stainless Works Ceramic LTH/HiFlo Cats SCT X4 Dynosteve, Hotckis 1" Springs & Chassis Max Brace BMR Adjustable Swaybars,Trailing Arms, Adjustable Toe Rod, LCA & Z28 UCA Bushings Hendrix Solid Cradle Bushings Pedders Radius Rod Inserts Strut tower brace Hero Smoked Tail and 3rd Brake Light, Diode Dynamic SL1 Fog Lights AeroForce Dual gauge/Autometer pillar mount. |
07-28-2022, 11:45 AM | #3 |
A buddy mentioned something similar.
He said that it could be incompatible brake compounds on the rotor where I would need to resurface the rotor to fix that. Do not know how true that is, but I did only run EBC compounds before switching to the HAWKs. It seems a resurfacing is needed.
__________________
2013 1SS/1LE
Corsa Extreme cat-back, Speed Engineering LT Headers with black ceramic coating, C7 Z06 Front Brake Upgrade, Mishimoto Oil Cooler, BMR Tunnel Brace, Mishimoto Oil Catch Can, MSD Plug Wires, Mishimoto Radiator and Hoses. |
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07-28-2022, 03:22 PM | #4 |
Drives: 2014 2SS/RS 6SP Ashen Grey Join Date: Aug 2021
Location: NY
Posts: 1,252
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If they are OEM and never been cut you can probably cut them with out much risk of them re warping quickly, But one cut is probably all you will get out of them. I am not sure what a shop will charge you to do it and honestly there are probably quite a few shops that don't even offer this service anymore.
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GM 3.91/TrueTrac OEM ZL1 Rims, Brakes & Side Skirts.ACST4 Splitter/Deflectors NPP M2W,GM Short Throw,Remote Clutch reservoir
GPI Ported Rod Mod,BO White PTB,CAI/JRE Scoop, Moroso Catch Can GC Aluminum DS Stainless Works Ceramic LTH/HiFlo Cats SCT X4 Dynosteve, Hotckis 1" Springs & Chassis Max Brace BMR Adjustable Swaybars,Trailing Arms, Adjustable Toe Rod, LCA & Z28 UCA Bushings Hendrix Solid Cradle Bushings Pedders Radius Rod Inserts Strut tower brace Hero Smoked Tail and 3rd Brake Light, Diode Dynamic SL1 Fog Lights AeroForce Dual gauge/Autometer pillar mount. |
07-29-2022, 09:50 AM | #5 |
Drives: 2012 Camaro 2SS/RS IOM Join Date: Mar 2013
Location: Calgary
Posts: 6
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Do you have steel brake lines? A buddy who tracks his car a lot said that as the fluid and lines heat up they constrict causing the shudder.
Maybe someone else that made the change to steel lines can comment. |
07-29-2022, 10:26 AM | #6 |
I got steel braided lines all around.
Only happened after a pad change. Had no luck finding a place to resurface them before my next event. Trying to just get more miles on the pads and get them more bedded in, hopefully that helps.
__________________
2013 1SS/1LE
Corsa Extreme cat-back, Speed Engineering LT Headers with black ceramic coating, C7 Z06 Front Brake Upgrade, Mishimoto Oil Cooler, BMR Tunnel Brace, Mishimoto Oil Catch Can, MSD Plug Wires, Mishimoto Radiator and Hoses. |
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