Clunk from front brake calipers?

sspddmn · 09-26-2020, 02:12 AM

New owner of a 2018 ZL1 1LE. Sometimes when I'm pulling out of my garage or anywhere for that matter, when I'm driving slow maybe 5-10mph, I hear a clunk noise when I push on the brake pedal. Anyone have this issue? If so is this normal? TIA!

driven2exceSS · 09-26-2020, 09:32 AM

Check torque of caliper bolts, make sure pads are correct size, anti-rattle spring, and pins are properly seated, torque bridge bolt, then torque wheel lugs?

sspddmn · 09-26-2020, 04:40 PM

Quote:

Originally Posted by driven2exceSS

Check torque of caliper bolts, make sure pads are correct size, anti-rattle spring, and pins are properly seated, torque bridge bolt, then torque wheel lugs?

Ok ill keep that in mind and have the tech at the chevy dealer check it out for me when I bring it in for fluid changes. Thanks for the advice.

Gunkk · 09-26-2020, 06:22 PM

Something is loose.

Check all the things.

Seriously, check the lugs, calipers, suspension components, steering links, strut tower... all the things.

Dabjbr · 09-26-2020, 06:41 PM

Often that's an indication that one of the bracket bolts that holds the caliper is loose or missing. If its completely backed out (top or bottom bolt), you might even see the caliper rotate slightly CW or CCW.

Have someone stand outside your car and watch while you move slowly forward & brake. Then backward and brake. Look at one wheel at a time. You'll either visibly see or hear where the clunk is coming from.

Report back. Good luck!

Apexslayer · 09-26-2020, 10:23 PM

Make sure its the brakes and not the shocks...

sspddmn · 09-26-2020, 11:27 PM

Thanks for all you guys input. Will definitely check them out on my own for anything loose before I take it out again.

sspddmn · 09-27-2020, 12:10 AM

Anyone got the torque specs for the calipers and caliper bracket bolts? Im at least check those tomorrow. TIA!

sspddmn · 09-27-2020, 10:17 PM

Nevermind. Found it. Thanks again everyone.

Alain · 09-29-2020, 05:41 PM

Quote:

Originally Posted by sspddmn

Nevermind. Found it. Thanks again everyone.

What's the verdict?

sspddmn · 10-01-2020, 07:06 PM

Quote:

Originally Posted by Alain

What's the verdict?

I checked the caliper bolts and they were torqued to spec. calipers look ok. pads are solid in place. don't know what else it could be causing the clunking noise. still does it. will have the dealer check it out when i take it in. will be soon. thanks.

Gunkk · 10-01-2020, 11:43 PM

...all the things.

driven2exceSS · 10-02-2020, 07:55 AM

Quote:

Originally Posted by Gunkk

...all the things.

Agreed. Being this is a 2018 (previously owned?) the owner could of stripped off aftermarket parts in a "rush" and put back to OEM, or moved the camber adjustment etc... anything. Something IS loose. Standing by for what is found. Best of luck narrowing it down!!

driven2exceSS · 10-07-2020, 10:27 AM

Quote:

Originally Posted by driven2exceSS

Standing by for what is found.

Any further luck with this?

09-26-2020, 02:12 AM	#1
sspddmn Drives: 2018 ZL1 1LE and 1991 Z28 Join Date: Jan 2009 Location: SF Bay but from the 808 Posts: 1,078	Clunk from front brake calipers? New owner of a 2018 ZL1 1LE. Sometimes when I'm pulling out of my garage or anywhere for that matter, when I'm driving slow maybe 5-10mph, I hear a clunk noise when I push on the brake pedal. Anyone have this issue? If so is this normal? TIA! __________________ In the garage: 2018 HBM ZL1 1LE // 2013 ZL1 (sold) // 1991 Camaro Z28 5.7L // 2016 Audi A6 Prestige Supercharged 3.0 V6 // 2002 Camaro SS (sold)

09-26-2020, 09:32 AM	#2
driven2exceSS Drives: 2016 2SS BLK A8 Vert Join Date: Dec 2017 Location: MA Posts: 1,029	Check torque of caliper bolts, make sure pads are correct size, anti-rattle spring, and pins are properly seated, torque bridge bolt, then torque wheel lugs? __________________ NPP, MRC, Tinted side & rear reflectors, OEM ZL1 Rockers / 3rd Brake / Darken tail lights, OEM Blk rear splash guards, Satin hood wrap, Fuse pull, Sound tube delete, Cat delete, Ported 95 TB, Ported MSD IM, Dry RotoFab, ARH 1 7/8 headers, E85, "Performance Dyno" Tune, BMR "pieces", "Track" alignment, Hawk DCT-70/70's w/SRF, Goodridge lines, Ti shims, Red powdered calipers, 18" APEX SM-10's w/ Pirelli DH's, FE4 Vert swaybars, Brake cooling ducts, ATI 10% UD, Vorshlag camber plates, OEM 1LE Splitter w/APR Ext., Velossa BIG MOUTH Ram Air, CF QA1, ZLE brakes(F)

09-26-2020, 11:27 PM	#7
sspddmn Drives: 2018 ZL1 1LE and 1991 Z28 Join Date: Jan 2009 Location: SF Bay but from the 808 Posts: 1,078	Thanks for all you guys input. Will definitely check them out on my own for anything loose before I take it out again. __________________ In the garage: 2018 HBM ZL1 1LE // 2013 ZL1 (sold) // 1991 Camaro Z28 5.7L // 2016 Audi A6 Prestige Supercharged 3.0 V6 // 2002 Camaro SS (sold)

09-27-2020, 12:10 AM	#8
sspddmn Drives: 2018 ZL1 1LE and 1991 Z28 Join Date: Jan 2009 Location: SF Bay but from the 808 Posts: 1,078	Anyone got the torque specs for the calipers and caliper bracket bolts? Im at least check those tomorrow. TIA! __________________ In the garage: 2018 HBM ZL1 1LE // 2013 ZL1 (sold) // 1991 Camaro Z28 5.7L // 2016 Audi A6 Prestige Supercharged 3.0 V6 // 2002 Camaro SS (sold)

09-27-2020, 10:17 PM	#9
sspddmn Drives: 2018 ZL1 1LE and 1991 Z28 Join Date: Jan 2009 Location: SF Bay but from the 808 Posts: 1,078	Nevermind. Found it. Thanks again everyone. __________________ In the garage: 2018 HBM ZL1 1LE // 2013 ZL1 (sold) // 1991 Camaro Z28 5.7L // 2016 Audi A6 Prestige Supercharged 3.0 V6 // 2002 Camaro SS (sold)

09-26-2020, 06:22 PM	#4
Gunkk Thank you Al Oppenheiser! Drives: Red Hot A10 ZL1 Convertible Join Date: Jun 2017 Location: Sarasota, FL Posts: 4,975 View My Garage	Something is loose. Check all the things. Seriously, check the lugs, calipers, suspension components, steering links, strut tower... all the things.

09-26-2020, 06:41 PM	#5
Dabjbr Drives: 2020 SS 1LE Join Date: Aug 2020 Location: NorCal Posts: 658	Often that's an indication that one of the bracket bolts that holds the caliper is loose or missing. If its completely backed out (top or bottom bolt), you might even see the caliper rotate slightly CW or CCW. Have someone stand outside your car and watch while you move slowly forward & brake. Then backward and brake. Look at one wheel at a time. You'll either visibly see or hear where the clunk is coming from. Report back. Good luck!

09-26-2020, 10:23 PM	#6
Apexslayer Drives: Zl1 1le Join Date: Apr 2018 Location: Midwest Posts: 183	Make sure its the brakes and not the shocks...

10-01-2020, 11:43 PM	#12
Gunkk Thank you Al Oppenheiser! Drives: Red Hot A10 ZL1 Convertible Join Date: Jun 2017 Location: Sarasota, FL Posts: 4,975 View My Garage	...all the things.

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