Brake Caliper Bolts - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

deahl001 · 03-10-2017, 01:21 PM

I read somewhere that the brake caliper bolts should be replaced any time they are removed. I've never seen that on any other car I've worked on... Can anyone confirm/deny that based on GM documentation?

While I'm asking questions, anyone know the torque spec for those bolts?

jayno20 · 03-10-2017, 02:20 PM

They are torque to yeild bolts so they are really only meant to be used once. I'm pretty sure that's how they are on most cars.

Stephen12ZL1 · 03-11-2017, 08:02 AM

most people reuse them without incident...most dealers do not replace the caliper bolts. Surprisingly, it was mentioned that many dealerships don't replace head bolts either. I retorqued my caliper bolts without any problem, but I suppose we should do what GM suggests.

KaBoom1701 · 03-11-2017, 08:05 AM

There like $8 dollars....cheap insurance when messing with your brakes IMHO.

Sakudog · 03-11-2017, 09:18 AM

I've reused mine and the car has seen some pretty heavy breaking and some light track use. That being said, I should have replaced them technically.

Blownfogger540 · 03-11-2017, 02:19 PM

from over the years my experience is any bolt that has a 10.9 12.9 on the head can not be a one time use
as that's a metric grade rating

E. Bryant · 03-12-2017, 10:25 AM

As best as I can tell, these bolts are not "torque to yield". They are indeed "torque to angle", and according to my torque wrench, the factory torque process puts them right about at the recommended maximum torque for the bolt size and grade.

The bolts do have thread locker applied as supplied, and I suspect that this is the reason for the recommendation to replace them after each use.

If in doubt, follow the factory recommendations. This is not a place to be making half-ass assumptions just because some random dude on the internet did some arm-chair engineering "analysis".

deahl001 · 03-13-2017, 07:28 AM

For anyone curious, a GM tech found in the service information that these bolts should be replaced when removed. For such a low price, I'm going with that advice. Thanks for the input!

Part number 11570788 - Qty 4 - Torque 30 ft lbs + 90 degrees

winterboy8 · 03-13-2017, 08:01 AM

Not doubting anyone, but I work in aerospace and have never heard of a torque that was xx lbs plus xx degrees after reaching that initial number.

deahl001 · 03-13-2017, 08:13 AM

Quote:

Originally Posted by winterboy8

Not doubting anyone, but I work in aerospace and have never heard of a torque that was xx lbs plus xx degrees after reaching that initial number.

It's common practice in cars. Specifically in motor work. When you are working on heads, you typically use that method. Also, the GM spec is below for the brakes on our cars.

Russell James · 03-13-2017, 08:29 AM

Any bolt where the tq spec is given in degrees past a tq is a TTY bolt.

TTY is a more consistent tq when sealants, lubes, locking agents... are used. Those things can throw the tq reading way off, so to get a consistent clamp and bolt stretch you do it in degrees. The bold stretching will maintain a stronger clamp force.

It can only be done once though, the second stretch to that length will not have the same clamping force. It's been fatigued and will just keep stretching instead of clamping. If someone successfully re-used a TTY bolt, they probably didn't stretch it the second time and it is not tq'd properly.

At a drag strip near me there was a critical head injury, someone got hit by a harmonic balancer at the starting line. As the lawsuits were flying, one of the defendants had a failure analysis done. End result... a TTY balancer bolt had been reused and snapped. The shop that did the last motor refresh was in a world of hurt. Any time negligence is involved, it can become $$$$$$$ and even criminal.

If you see anyone re-using a TTY bolt, you are looking at an idiot. Harsh, but fact. They teach that sht in HS auto shop, let alone a tech degree, state certification tests....

hammersfd · 07-07-2019, 11:19 AM

Reviving a dead thread here, but are the rear bolts same as the fronts? I can only find listings for the front.

VRZL113 · 07-08-2019, 11:28 AM

Quote:

Originally Posted by hammersfd

Reviving a dead thread here, but are the rear bolts same as the fronts? I can only find listings for the front.

They are not the same.

Rear caliper to knuckle bolts part# 11515781

ZMEnow · 07-08-2019, 09:06 PM

Quote:

Originally Posted by VRZL113

They are not the same.

Rear caliper to knuckle bolts part# 11515781

His tag says SS not ZL1, if that's the case its not the same brembo.

03-10-2017, 01:21 PM	#1
deahl001 Drives: 2013 Chevrolet Camaro ZL1 CRT M6 Join Date: Jul 2013 Location: Atlanta, GA Posts: 103	Brake Caliper Bolts I read somewhere that the brake caliper bolts should be replaced any time they are removed. I've never seen that on any other car I've worked on... Can anyone confirm/deny that based on GM documentation? While I'm asking questions, anyone know the torque spec for those bolts? __________________ 2013 Camaro ZL1 - CRT M6 ECF

03-11-2017, 08:02 AM	#3
Stephen12ZL1 Drives: '21 ZLE A10 Join Date: May 2012 Location: Mechanicsville, VA Posts: 6,808	most people reuse them without incident...most dealers do not replace the caliper bolts. Surprisingly, it was mentioned that many dealerships don't replace head bolts either. I retorqued my caliper bolts without any problem, but I suppose we should do what GM suggests. __________________ '21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60' '17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)

03-11-2017, 08:05 AM	#4
KaBoom1701 KaBoom1701 Drives: 13' ZL1 Red M6 Join Date: Dec 2012 Location: I.E. SoCal (Yucaipa) Posts: 8,630	There like $8 dollars....cheap insurance when messing with your brakes IMHO. __________________ Mods: Roto-Fab Intake, WW Res. kit & Big Gulp Air Scoop, Elite Catch Can, ATI Super Damper & 18% OD Pulley, LF Idler pulley bracket, Metco CC breather, ID850 Injectors, Stainless Power Headers w/ ceramic coating, TR71X Spark Plugs, JMS Fuel Pump Booster, Bo White TB, Tuned by Ted @ Jannetty Racing, Ron Davis HX, D3 Reservoir, Pfadt 1" Springs, Moreno Camber Plates, ZL1 Addons Splitter guard washers, Tow Hook kit & rock guards, Hurst Shifter Billet Plus 6 Speed Short Shifter, ZL1 DRL lighting harness, ZL1 Recaro Seats.

03-11-2017, 09:18 AM	#5
Sakudog Drives: 2019 ZL1 1LE A10 Join Date: Jan 2015 Location: The ATX Posts: 966	I've reused mine and the car has seen some pretty heavy breaking and some light track use. That being said, I should have replaced them technically. __________________ Ryker #29 2019 ZL1 1LE A10 2015 Z/28 #809

03-12-2017, 10:25 AM	#7
E. Bryant Gearhead Drives: 2012 ZL1 Join Date: Jun 2014 Location: Michigan Posts: 252	As best as I can tell, these bolts are not "torque to yield". They are indeed "torque to angle", and according to my torque wrench, the factory torque process puts them right about at the recommended maximum torque for the bolt size and grade. The bolts do have thread locker applied as supplied, and I suspect that this is the reason for the recommendation to replace them after each use. If in doubt, follow the factory recommendations. This is not a place to be making half-ass assumptions just because some random dude on the internet did some arm-chair engineering "analysis". __________________ 2012 Chevrolet Camaro ZL1 M6 - JRE 650 RWHP kit, AFCO heat exchanger, JPSS V4 aero, Z28 wheels for the twisties and Weld big-n-littles for the dragstrip. 11.193@128.13 in 515' DA

03-10-2017, 02:20 PM	#2
jayno20 Go fast, please. Drives: 2019 Corvette ZR1 Join Date: May 2014 Location: Pittsburgh, PA Posts: 2,471 View My Garage	They are torque to yeild bolts so they are really only meant to be used once. I'm pretty sure that's how they are on most cars.

03-11-2017, 02:19 PM	#6
Blownfogger540 Drives: 2013 ZL1 416 Join Date: Feb 2013 Location: Langley B.C Posts: 2,619	from over the years my experience is any bolt that has a 10.9 12.9 on the head can not be a one time use as that's a metric grade rating

03-13-2017, 07:28 AM	#8
deahl001 Drives: 2013 Chevrolet Camaro ZL1 CRT M6 Join Date: Jul 2013 Location: Atlanta, GA Posts: 103	For anyone curious, a GM tech found in the service information that these bolts should be replaced when removed. For such a low price, I'm going with that advice. Thanks for the input! Part number 11570788 - Qty 4 - Torque 30 ft lbs + 90 degrees __________________ 2013 Camaro ZL1 - CRT M6 ECF

03-13-2017, 08:01 AM	#9
winterboy8 Drives: 2015 ZL1 Blue Velvet Metallic Join Date: Mar 2015 Location: Melbourne, FL Posts: 720 View My Garage	Not doubting anyone, but I work in aerospace and have never heard of a torque that was xx lbs plus xx degrees after reaching that initial number. __________________ Roto-Fab CAI, ARH LT, SW 3" catback, JRE tune, Elite-2 CC, VMAX TB, Big Gulp, WW II relo, Lingenfelter S/C reservoir

03-13-2017, 08:29 AM	#11
Russell James Drives: '15 SS 1LE, '69 Z28 drag car Join Date: Dec 2009 Location: Mich Posts: 4,482	Any bolt where the tq spec is given in degrees past a tq is a TTY bolt. TTY is a more consistent tq when sealants, lubes, locking agents... are used. Those things can throw the tq reading way off, so to get a consistent clamp and bolt stretch you do it in degrees. The bold stretching will maintain a stronger clamp force. It can only be done once though, the second stretch to that length will not have the same clamping force. It's been fatigued and will just keep stretching instead of clamping. If someone successfully re-used a TTY bolt, they probably didn't stretch it the second time and it is not tq'd properly. At a drag strip near me there was a critical head injury, someone got hit by a harmonic balancer at the starting line. As the lawsuits were flying, one of the defendants had a failure analysis done. End result... a TTY balancer bolt had been reused and snapped. The shop that did the last motor refresh was in a world of hurt. Any time negligence is involved, it can become $$$$$$$ and even criminal. If you see anyone re-using a TTY bolt, you are looking at an idiot. Harsh, but fact. They teach that sht in HS auto shop, let alone a tech degree, state certification tests....

07-07-2019, 11:19 AM	#12
hammersfd Drives: 2017 SS Convertible Fiftieth Anniv Join Date: Jul 2018 Location: Boston Posts: 163	Reviving a dead thread here, but are the rear bolts same as the fronts? I can only find listings for the front.