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Old 07-28-2022, 12:09 AM   #1
Trawz
 
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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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Old 07-28-2022, 07:44 AM   #2
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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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Old 07-28-2022, 11:45 AM   #3
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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.
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Old 07-28-2022, 03:22 PM   #4
Joe.G

 
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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
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Old 07-29-2022, 09:50 AM   #5
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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.
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Old 07-29-2022, 10:26 AM   #6
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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.
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