Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com
 
Roto-Fab
Go Back   Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com > Technical Camaro Topics > Suspension / Brakes / Chassis


Reply
 
Thread Tools
Old 06-22-2022, 03:22 PM   #1
DavidH
 
DavidH's Avatar
 
Drives: 2010 Camaro 2SS
Join Date: Jul 2021
Location: Chillicothe, Oh
Posts: 138
Dorman 14947 brake caliper bracket bolts on SS with brembos

With oem bolts being Torque to angle, I opted for the dorman bolts as they were $6 for both front calipers instead of $60. The dorman bolts do not list anywhere as TTY bolt, but comes up a few threads shy.

Thoughts on these being safe to run? I'm sure I will get another thread or two once torqued as the washer wants to "crush" down.
Attached Images
  

Last edited by DavidH; 06-24-2022 at 04:51 AM.
DavidH is offline   Reply With Quote
Old 06-23-2022, 08:23 AM   #2
kevint
 
Drives: 2013 1SS
Join Date: Dec 2012
Location: New Jersey
Posts: 714
I'm looking at an old caliper bolt right now and it's a standard grade 10.9 M14X2 hex bolt with a flanged head. GM got a little funky with the length of the shoulder (unthreaded portion) but this is otherwise an off-the-shelf item. You can buy yourself a little more thread engagement if you get rid of the extra washer: that's the point of the flanged head and the original bolts didn't have them.
kevint is offline   Reply With Quote
Old 06-23-2022, 11:54 AM   #3
DavidH
 
DavidH's Avatar
 
Drives: 2010 Camaro 2SS
Join Date: Jul 2021
Location: Chillicothe, Oh
Posts: 138
The washer isn't removable unfortunately. ID of the washer is smaller than the threads. I'm headed to the hardware store tonight for the rotor retainer bolt. I'll take a look and see what they have in the size for the caliper bracket.


Given the choice between reusing the old bolts that had obvious thread damage or these, I went with these and some red loctite. Probably hit up the local GM dealer this weekend as well for OEM bolts if they have them
DavidH is offline   Reply With Quote
Old 06-23-2022, 01:27 PM   #4
cdb95z28


 
cdb95z28's Avatar
 
Drives: 2022 1SS 1LE A10 BCD WCT+PDR
Join Date: Mar 2008
Location: Johnstown, PA
Posts: 3,192
The OE bolt is not Torque To Yield. They are Torque To Angle. There is a difference. I had the '14 service manual and nowhere it says they are one time use. Clean the threads in the caliper and on the bolt, and use high temp high strength threadlocker and set to the OE specs.
__________________
2022 1SS 1LE A10 BCD WCT+PDR2014 1SS 1LE NPP RECARO SIM-SOLD1995 Z28 M6 GSC PGM-SOLD1975 NOVA COUPE 300HP 350 TH350 FLASH RED-SOLD
cdb95z28 is offline   Reply With Quote
Old 06-24-2022, 04:50 AM   #5
DavidH
 
DavidH's Avatar
 
Drives: 2010 Camaro 2SS
Join Date: Jul 2021
Location: Chillicothe, Oh
Posts: 138
Quote:
Originally Posted by cdb95z28 View Post
The OE bolt is not Torque To Yield. They are Torque To Angle. There is a difference. I had the '14 service manual and nowhere it says they are one time use. Clean the threads in the caliper and on the bolt, and use high temp high strength threadlocker and set to the OE specs.
Correct. Technically torque to angle. I always get them backwards. I have found so much conflicting information on here that I wound up just running the new bolts until I can get new GM bolts. It made no sense to me that a 14mm fastener could fatigue that much. I can't count how many times I've reused bracket bolts on other vehicles.

What baffles me is the dorman bolts absolutely would not go to 90 degrees. I got them to around 70 degrees but I am either going to snap my breaker bar or lift the corner of the suspension to the point of risking too much movement on the jackstands. The overall torque on this bolt right now is at least in excess of 140 ftlbs. I'm putting more strain on them than I do my Silverados lug nuts.
DavidH is offline   Reply With Quote
Old 06-24-2022, 05:43 AM   #6
kevint
 
Drives: 2013 1SS
Join Date: Dec 2012
Location: New Jersey
Posts: 714
An impact gun is your friend here. A quick buzz will get you to 90 degrees.
kevint is offline   Reply With Quote
Old 06-24-2022, 07:31 AM   #7
cdb95z28


 
cdb95z28's Avatar
 
Drives: 2022 1SS 1LE A10 BCD WCT+PDR
Join Date: Mar 2008
Location: Johnstown, PA
Posts: 3,192
Quote:
Originally Posted by DavidH View Post
Correct. Technically torque to angle. I always get them backwards. I have found so much conflicting information on here that I wound up just running the new bolts until I can get new GM bolts. It made no sense to me that a 14mm fastener could fatigue that much. I can't count how many times I've reused bracket bolts on other vehicles.

What baffles me is the dorman bolts absolutely would not go to 90 degrees. I got them to around 70 degrees but I am either going to snap my breaker bar or lift the corner of the suspension to the point of risking too much movement on the jackstands. The overall torque on this bolt right now is at least in excess of 140 ftlbs. I'm putting more strain on them than I do my Silverados lug nuts.
I wonder if the integrated washer on the Dorman will change the final toque result vs the OE bolt. FWIW, when I had my '14 1LE, which I tracked, I would be removing my calipers at least once annually. I would of course reuse the caliper bolts. I torqued those bolts to 145 ft/lbs with high temp/high strength loctite. IIRC, I figured out what the final torque was when I tightened them to the GM spec. 145 is close to the recommended torque spec for that thread pitch/diameter and grade bolt. And yep, I could easily start to lift the drooped suspension with my torque wrench, but I never was concerned about lifting the rest of the car.

If your Silverado is a late model, it's lug stud is also a 14mm diameter.
__________________
2022 1SS 1LE A10 BCD WCT+PDR2014 1SS 1LE NPP RECARO SIM-SOLD1995 Z28 M6 GSC PGM-SOLD1975 NOVA COUPE 300HP 350 TH350 FLASH RED-SOLD
cdb95z28 is offline   Reply With Quote
Old 06-24-2022, 07:33 AM   #8
cdb95z28


 
cdb95z28's Avatar
 
Drives: 2022 1SS 1LE A10 BCD WCT+PDR
Join Date: Mar 2008
Location: Johnstown, PA
Posts: 3,192
I'm not a fan of driving home or breaking loose critical fasteners with an impact. The hammering action can be quite stressful on them, especially if the impact gun has a large capacity. A long breaker bar gets the job done.
__________________
2022 1SS 1LE A10 BCD WCT+PDR2014 1SS 1LE NPP RECARO SIM-SOLD1995 Z28 M6 GSC PGM-SOLD1975 NOVA COUPE 300HP 350 TH350 FLASH RED-SOLD
cdb95z28 is offline   Reply With Quote
Old 06-24-2022, 09:24 AM   #9
DavidH
 
DavidH's Avatar
 
Drives: 2010 Camaro 2SS
Join Date: Jul 2021
Location: Chillicothe, Oh
Posts: 138
Yes sir, 1999 so stud torque is 140ft lbs.

And the washer is leaving me skeptical. It's not the first time I've gotten parts from rockauto that said they would fit and in fact would not. I know full well these bolts will fit the V6, but I have brembos. I've already compressed the suspension to the max doing so, and I heard the jackstands creak the other evening. I'd say they are plenty tight, but I'm 2 threads shy of the bolt protruding like the OEM bolts.

I can't get my impact in there and won't try. It is capable of tightening to 300ft lbs. I've sheared off numerous 16mm bolts with it. If I can't get this angle set, I'll swing by the GM dealer on lunch and grab some bolts.

This is the only vehicle over ever owned that recommended replacement of caliper bracket bolts. With mine being a touch chewed up, I'm not going to risk it. Otherwise I would probably do what you did and just reuse them.
DavidH is offline   Reply With Quote
Old 06-24-2022, 10:22 AM   #10
cdb95z28


 
cdb95z28's Avatar
 
Drives: 2022 1SS 1LE A10 BCD WCT+PDR
Join Date: Mar 2008
Location: Johnstown, PA
Posts: 3,192
While I don't have my '14 service manual anymore as I bought a '22 SS 1LE, I don't think GM says to replace the caliper bolts. Even my '22's manual states it's caliper bolts can be reused and the Brembos systems between the Gen5 and Gen6 are similar except for sizing.
__________________
2022 1SS 1LE A10 BCD WCT+PDR2014 1SS 1LE NPP RECARO SIM-SOLD1995 Z28 M6 GSC PGM-SOLD1975 NOVA COUPE 300HP 350 TH350 FLASH RED-SOLD
cdb95z28 is offline   Reply With Quote
Old 06-24-2022, 11:21 AM   #11
gtstorey

 
Drives: 2010 Camaro SS2,L99, LSA SC
Join Date: Aug 2017
Location: Huntsville, AL
Posts: 2,129
I think the 5th gen manual does say to replace, but I think it has more to do with the Loctite than being torque to yield. I reuse and retighten by feel. I did replace the fronts with some dorman bolts when I went to the CTSV calipers since the head was getting a little worn from multiple preassemblies.
gtstorey is offline   Reply With Quote
Old 06-24-2022, 01:08 PM   #12
demonspeed
not afraid of the wall
 
demonspeed's Avatar
 
Drives: Camaros
Join Date: Apr 2010
Location: Pittsburgh
Posts: 2,148
2013 factory service manual says to replace caliper bolts. Here’s a picture for the front, but it says the same for the rear:
Attached Images
 
__________________
2023 1LE 1SS BCD GCF JF5 MN6 SIA SLN UQT
10/13/22: 1100
Past Camaros: 13 1LE|02 SS|01 Z28|00 SS|91 1LE|91 Z28|89 IROC-Z
demonspeed is offline   Reply With Quote
Old 06-24-2022, 04:06 PM   #13
cdb95z28


 
cdb95z28's Avatar
 
Drives: 2022 1SS 1LE A10 BCD WCT+PDR
Join Date: Mar 2008
Location: Johnstown, PA
Posts: 3,192
Quote:
Originally Posted by gtstorey View Post
I think the 5th gen manual does say to replace, but I think it has more to do with the Loctite than being torque to yield. I reuse and retighten by feel. I did replace the fronts with some dorman bolts when I went to the CTSV calipers since the head was getting a little worn from multiple preassemblies.
Quote:
Originally Posted by demonspeed View Post
2013 factory service manual says to replace caliper bolts. Here’s a picture for the front, but it says the same for the rear:
I stand corrected!
__________________
2022 1SS 1LE A10 BCD WCT+PDR2014 1SS 1LE NPP RECARO SIM-SOLD1995 Z28 M6 GSC PGM-SOLD1975 NOVA COUPE 300HP 350 TH350 FLASH RED-SOLD
cdb95z28 is offline   Reply With Quote
 
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 09:30 PM.


Powered by vBulletin® Version 3.8.9 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.