I didn't have 1/2" drive tools. I've been doing brakes and other vehicle repairs for over 20 years and I've never needed 1/2" drive for anything besides drive axle and strut mount nuts.
This was just a couple measly 17 millimeter bolts. If anything, I would have expected the bolt head to round off first, I've never twisted a 3/8" extension to the point of breaking before.
Hell, I've even done head gaskets using a 3/8" drive and it didn't break. It wasn't HF either..
17mm bolt head means nothing. Does not necessarily correlate with the thread diameter in applications such as caliper bracket bolts. Most will be a flange head bolt with greater than normal thread diameters.
1/2 drive is always the answer for caliper bracket bolts no matter the manufacturer.
I've never seen this happen before unless a cheater bar or hammer or whatever was used. That would be misuse. I was not using a cheater bar or hammer though, I was only using my bare hands and muscle.
If I had a torque wrench, it would be interesting to test a variety of brands of extensions to determine their failure points.
I'm curious, how long is your 3/8 ratchet handle? Pretty hard to get over 80 ft lbs using a dinky short ratchet.
That's why 1/2 is used, for breakaway and the leverage needed to torque to the correct spec. Caliper bracket bolts are pretty important to be tightened correctly.
My tools are in the vehicle downstairs right now, so I'm not currently sure exactly how long the ratchet handle is, but it's not significantly long. If anything it's basically about the average length you would expect a cheap 3/8" ratchet to be.
Aviation mech, my rule is harbor freight for everything you don't put a lot of force on or trust your life to. (Breaker bars, extensions, sockets, lanyards, jacks, etc) Also Snapon is no longer worth it, it's all Chinese rebranded shit nowadays, I've seen them bend/break as much as any harbor freight tool.
I live about 2 miles from the Snap On factory where they make most of their tools and I'm not in China. I don't know where the materials come from though.
You don't just up and buy a higher quality version when you're stuck on the side of the road, you count your blessings that you have like 5 other extensions, all better brands than HF.
It's almost a nice convenient road kit, but yeah when you can literally twist-break an extension just using your hands and arms, the metal is shit tempered and can't handle torsion forces.
Which is exactly what ratchets and extensions are meant to handle, torsion forces, AKA twisty forces.
Oh for emergency in the car tools totally get the good stuff. But when you are trying to outfit your garage cheaply to get stuff done, it's a good enough starting point.
If you can afford a garage, you can afford good tools. If I had a garage, you think I'd cheap out on my tools?
I had to go back at the bolt in question with a wrench from another kit after breaking the extension. At least I have other better extensions, I just didn't have them with me at the moment.