What is the torque spec for brake banjo bolts?
I'm assuming this is the same thing as the "brake caliper inlet fitting bolt" at 33-lb-ft?
http://www.davidfarmerstuff.com/C6-Torque-Auto.PDF TIA RMX |
That's what I torqued mine to 2 weeks ago.
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33 lb/ft is what the shop manual says but I have a friend that broke one off trying to torque to that setting. I just bought a set of StopTech brake lines and they say set Banjo Bolt to 14 lb/ft. Shop manual also says set brake pipe to flexable hose at 13 lb/ft. I'm wondering if they have these specs reversed? 33 lb/ft sounds high for a hollow bolt. Any pro mechanics out there that can shine some light on this for us. I'm not going to install my new StopTech SS brake lines until I know for sure what to set torque.
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Originally Posted by USA1C5
(Post 1570356947)
33 lb/ft is what the shop manual says but I have a friend that broke one off trying to torque to that setting. I just bought a set of StopTech brake lines and they say set Banjo Bolt to 14 lb/ft. Shop manual also says set brake pipe to flexable hose at 13 lb/ft. I'm wondering if they have these specs reversed? 33 lb/ft sounds high for a hollow bolt. Any pro mechanics out there that can shine some light on this for us. I'm not going to install my new StopTech SS brake lines until I know for sure what to set torque.
http://www.stoptech.com/tech_info/ma...C_03-02-06.pdf Yeah, those are C5 instructions but they are the same lines and calipers as I will have in a few days. 33 ft/lbs is way too much. San |
Originally Posted by oldmansan
(Post 1570357001)
I'm sticking with the 14 ft/lb from Stoptech. They also say not to use a torque wrench, but to tighten to approximately 14 ft/lb.
http://www.stoptech.com/tech_info/ma...C_03-02-06.pdf Yeah, those are C5 instructions but they are the same lines and calipers as I will have in a few days. 33 ft/lbs is way too much. San |
My guess is that they (Stoptech) don't want you to use a torque wrench as if it is not calibrated correctly you could overtorque and strip the threads.
San |
Originally Posted by oldmansan
(Post 1570362720)
My guess is that they (Stoptech) don't want you to use a torque wrench as if it is not calibrated correctly you could overtorque and strip the threads.
San For myself however, I would be more likely to strip threads or break a bolt by guessing at torque setting than using a torque wrench. Even if a torque wrech were off 10% we're only talking about 1.4 lb/ft. I would think even an uncalibrated torque wrench being off 10% would be whole lot. Having said that however, there is always that chance a torque wrench could be off more but my guessing at torque could be off much more too. Either way there's room for some kind of error. Take your pick I guess. :cheers: |
Bear in mind I'll be installing the Stoptech brakes, which have an aluminum brake caliper, not the C6 stock brakes. The torque for the stock brakes is probably completely different as the materials are different.
San |
Banjo Bolt Torque
Originally Posted by USA1C5
(Post 1570356947)
33 lb/ft is what the shop manual says but I have a friend that broke one off trying to torque to that setting. I just bought a set of StopTech brake lines and they say set Banjo Bolt to 14 lb/ft. Shop manual also says set brake pipe to flexable hose at 13 lb/ft. I'm wondering if they have these specs reversed? 33 lb/ft sounds high for a hollow bolt. Any pro mechanics out there that can shine some light on this for us. I'm not going to install my new StopTech SS brake lines until I know for sure what to set torque.
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Originally Posted by oldmansan
(Post 1570364546)
Bear in mind I'll be installing the Stoptech brakes, which have an aluminum brake caliper, not the C6 stock brakes. The torque for the stock brakes is probably completely different as the materials are different.
San |
Originally Posted by COL Dave L
(Post 1570364572)
I just broke off the head of a banjo bolt trying to use the 33 lb ft spec in my Corvette GM shop manual. I thought it was high, but I checked with the dealer and was told that 33 was correct. IT IS WRONG! The 14 lb ft sounds right to me, especially for a hollow bolt. I shoulda known better. Now I'm trying to find a replacement bolt, which seems scarce as hens teeth.
San |
Hmmm....I torqued mine to 33 and it worked out fine. Maybe a 25 lb might be safer next time around?
They were tight as hell when trying to remove them. RMX |
Originally Posted by COL Dave L
(Post 1570364572)
I just broke off the head of a banjo bolt trying to use the 33 lb ft spec in my Corvette GM shop manual. I thought it was high, but I checked with the dealer and was told that 33 was correct. IT IS WRONG! The 14 lb ft sounds right to me, especially for a hollow bolt. I shoulda known better. Now I'm trying to find a replacement bolt, which seems scarce as hens teeth.
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The factory bolts are different than the StopTec bolts. I have snapped the Stoptec bolts also they are made of a totally different material that even looks less stong. They don't need to be that strong just enough to get good seal with the crush washers.
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I got a replacement bolt today, GM Part # 11570052. This bolt is different than the OEM banjo bolt, which may have been built in Australia with the OEM caliper. The GM replacement bolt has a hex washer head and is zinc plated, while the OEM bolt is a hex head and seems to be made of stainless steel, plus it is machined in greater detail. However, I feel the replacement will work. Two-hundred mile trip to a dealer that had just one in stock!
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