06-22-2022, 03:22 PM | #1 |
Drives: 2010 Camaro 2SS Join Date: Jul 2021
Location: Chillicothe, Oh
Posts: 138
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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. Last edited by DavidH; 06-24-2022 at 04:51 AM. |
06-23-2022, 08:23 AM | #2 |
Drives: 2013 1SS Join Date: Dec 2012
Location: New Jersey
Posts: 714
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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.
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06-23-2022, 11:54 AM | #3 |
Drives: 2010 Camaro 2SS Join Date: Jul 2021
Location: Chillicothe, Oh
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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 |
06-23-2022, 01:27 PM | #4 |
Drives: 2022 1SS 1LE A10 BCD WCT+PDR Join Date: Mar 2008
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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.
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06-24-2022, 04:50 AM | #5 | |
Drives: 2010 Camaro 2SS Join Date: Jul 2021
Location: Chillicothe, Oh
Posts: 138
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Quote:
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. |
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06-24-2022, 05:43 AM | #6 |
Drives: 2013 1SS Join Date: Dec 2012
Location: New Jersey
Posts: 714
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An impact gun is your friend here. A quick buzz will get you to 90 degrees.
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06-24-2022, 07:31 AM | #7 | |
Drives: 2022 1SS 1LE A10 BCD WCT+PDR Join Date: Mar 2008
Location: Johnstown, PA
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Quote:
If your Silverado is a late model, it's lug stud is also a 14mm diameter.
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06-24-2022, 07:33 AM | #8 |
Drives: 2022 1SS 1LE A10 BCD WCT+PDR Join Date: Mar 2008
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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.
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06-24-2022, 09:24 AM | #9 |
Drives: 2010 Camaro 2SS Join Date: Jul 2021
Location: Chillicothe, Oh
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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. |
06-24-2022, 10:22 AM | #10 |
Drives: 2022 1SS 1LE A10 BCD WCT+PDR Join Date: Mar 2008
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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.
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06-24-2022, 11:21 AM | #11 |
Drives: 2010 Camaro SS2,L99, LSA SC Join Date: Aug 2017
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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.
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06-24-2022, 01:08 PM | #12 |
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2013 factory service manual says to replace caliper bolts. Here’s a picture for the front, but it says the same for the rear:
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06-24-2022, 04:06 PM | #13 | |
Drives: 2022 1SS 1LE A10 BCD WCT+PDR Join Date: Mar 2008
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Quote:
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