Shaking Under Heavy Braking on Track - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Trawz · 08-23-2024, 12:18 PM

I have been getting some shaking/shuddering under heavy braking on track.
In about 3-5 laps it starts to show and gets worse the longer I lap.

After about 2 cool laps, it gets better but starts back up when I pick up the pace again, it starts again.

It defiantly feels more like it is coming from the rear. The steering wheel does not shake at all when it is happening.
I replaced the rear brakes and pads thinking it was poor pad bed-in or a warped rotor. The shake still shows up. Does not shake at all when on throttle or off throttle. Only when braking medium to hard.
Also NEVER shows on the street.
Something is obviously getting hot and causing this.

It sucks to spend half of my session cooling off whatever it is.

What else should I check over?

fz4k98 · 08-23-2024, 07:20 PM

Could be caliper hanging up when hot.

Moto-Mojo · 09-08-2024, 10:03 AM

I fought this on the street under hard braking with new Hawk pads and drilled and slotted Powerstop rotors. Mine was more from the front. I had to switch pads but can't remember who's I used. It was a better grade auto parts store brand.

I re-burnished them and it still did it a little but eventually went away. The break-in thing is really important to lay down a layer of burned pad material onto the rotor. Seems like our cars like the OE Brembo setup the most. Maybe the most forgiving? Try and find some good Raybestos pads, reseat them and it should help - if a rotor isn't bad.

08-23-2024, 12:18 PM	#1
Trawz Drives: 2013 Camaro 1LE Join Date: Jan 2019 Location: Portland, OR Posts: 298 View My Garage	Shaking Under Heavy Braking on Track I have been getting some shaking/shuddering under heavy braking on track. In about 3-5 laps it starts to show and gets worse the longer I lap. After about 2 cool laps, it gets better but starts back up when I pick up the pace again, it starts again. It defiantly feels more like it is coming from the rear. The steering wheel does not shake at all when it is happening. I replaced the rear brakes and pads thinking it was poor pad bed-in or a warped rotor. The shake still shows up. Does not shake at all when on throttle or off throttle. Only when braking medium to hard. Also NEVER shows on the street. Something is obviously getting hot and causing this. It sucks to spend half of my session cooling off whatever it is. What else should I check over? __________________ 2013 1SS/1LE Corsa Extreme cat-back, Speed Engineering LT Headers with black ceramic coating, C7 Z06 Front Brake Upgrade, Custom Mishimoto Oil Cooler, BMR Tunnel Brace, Custom Dual Mishimoto Oil Catch Cans, MSD Plug Wires, Mishimoto Radiator and Hoses, Melling High Volume/High Flow Oil Pump, Improved Racing Oil Pan Baffle Kit, Improved Racing Oil Pressure Bypass Delete, Improved Racing Oil Pick-up Tube Clamp. Last edited by Trawz; 08-25-2024 at 12:11 AM.

09-08-2024, 10:03 AM	#3
Moto-Mojo Fast Cars and Old Guitars Drives: 2015 2SS RS (L99, baby!) Join Date: Apr 2012 Location: N. CA Posts: 4,216	I fought this on the street under hard braking with new Hawk pads and drilled and slotted Powerstop rotors. Mine was more from the front. I had to switch pads but can't remember who's I used. It was a better grade auto parts store brand. I re-burnished them and it still did it a little but eventually went away. The break-in thing is really important to lay down a layer of burned pad material onto the rotor. Seems like our cars like the OE Brembo setup the most. Maybe the most forgiving? Try and find some good Raybestos pads, reseat them and it should help - if a rotor isn't bad. __________________ “I don’t want to belong to any club that would have me as a member.” - Groucho Marx

08-23-2024, 07:20 PM	#2
fz4k98 Drives: 2013 1ss Join Date: Jul 2012 Location: WI. Posts: 569	Could be caliper hanging up when hot.