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YOUR RESEARCHStripped Brake Caliper Bolt Hub Threads - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Replace not reused every time they're removed
Performed · outcome unconfirmed
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed
Porsche specifies these screws be replaced, not reused every time they're removed.
Stripped Brake Caliper Bolt Hub Threads - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Replace not reused every time they're removed' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Repair process' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
The drill and countersink bits in the kit were too big for the chuck on my drill so I used a 3/8" socket bit in the drill and a socket to fit onto the end of the drill shank.
Stripped Brake Caliper Bolt Hub Threads - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use ratchet and socket
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
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Unsuccessful attempts
1
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
I used a ratchet and socket to carefully run the tap into the hub by hand.
Stripped Brake Caliper Bolt Hub Threads - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Repair process
Suggestion or failed attempt
No successful repair reported for this finding.
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Reported fixes
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Unsuccessful attempts
1
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Stripped Brake Caliper Bolt Hub Threads - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Repair threads
Suggestion or failed attempt
No successful repair reported for this finding.
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Reported fixes
0
Unsuccessful attempts
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
Two choices - I could replace the hub or try to repair the threads.
Stripped Brake Caliper Bolt Hub Threads - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Replace brakes (pads and rotors) and found
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Discussions that contain suggestions
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
I was in the process of changing my brakes (pads and rotors) and found that the upper caliper bolt on the front right wouldn't torque properly (it would tighten and then turn more, tighten and turn more, etc).
Stripped Brake Caliper Bolt Hub Threads - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use 3/8" socket bit in the drill and a socket
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
The drill and countersink bits in the kit were too big for the chuck on my drill so I used a 3/8" socket bit in the drill and a socket to fit onto the end of the drill shank.
Stripped Brake Caliper Bolt Hub Threads - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Coverage and how to read this overview
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
20 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T152433Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Ohhh Noooo! I was in the process of changing my brakes (pads and rotors) and found that the upper caliper bolt on the front right wouldn't torque properly (it would tighten and then turn more, tighten and turn more, etc). Damn, I knew this wasn't good.
Removed the caliper and found that the threads inside the hub were stripped. My first thought was "who worked on this last?". Uh. It was me.
Two choices - I could replace the hub or try to repair the threads. I tried using a thread tap but they were already too far gone to be chased properly so I ordered a kit called Time-Sert in the proper size. The kit was kind of expensive ($96) but it was still cheaper than replacing the hub.
Amazon Time-Sert M12x1.5
The kit came with everything you need and five inserts. It was easy to use with very clear instructions. Here is the repair process:
Drill out the hole. The drill and countersink bits in the kit were too big for the chuck on my drill so I used a 3/8" socket bit in the drill and a socket to fit onto the end of the drill shank.
Drill out a counter sink....
Tap the new threads. I used a ratchet and socket to carefully run the tap into the hub by hand.
Screw in the insert and you're back in business!
I also ordered new caliper bolts. The new bolts came with a star pattern rather than the old hex pattern. Good thing that I already have a full set of star sockets!
The caliper bolt torqued up properly and here it is, all done! Took me about 30 mins. I took my time and tried not to screw it up (really wanted to avoid the time to replace the hub!).
Ready for pads!
Great job!!!!!
Everytime I pick up a new tool, the last one being the power bleeder, I tell her it will pay for itself the moment it touches the car.
+1 on the rent-a-tool. With reasonable to/from postage it'll pay for itself many times over.
Cheers!
We use them at my dealership all the time on blown out spark plugs. Saves the customer a ton of money. But you have to install them right, or they can also spell doom.
For us racers that change the rotors frequently, I can highly recommend getting a stud kit:
Brake Caliper Stud Kit - Cup Car Style-Rennline, Inc.
If you have a contact at the dealership you can buy the PMNA cup car parts instead for a little cheaper.
Thanks! I counted and found that I've pulled the calipers at least 15 times - so far. Its only a matter of time until another hub thread strips out again. I'll see if House Automotive can get me the 996 Cup studs and swap out the bolts the next time that I do the brakes.
Pretty much every car manufacturer today recommends replacement, not just Porsche.
If they are one time stretch fasteners, then yes it makes sense, well, except for being stretch fasteners to begin with. Otherwise, it's definitely a belts & suspenders approach b/c the stresses on them are more compressive than tensile... well, except on my F150 which specified 150 lb ft. of torque along w/ loctite blue - LOL.
They make a stud for that too, and that stud is fiddly to get the bracket over. I'm moving the caliper studs over, but still debating on moving those bracket studs
You guys must have some bad luck. I've taken off and reinstalled somewhere around 200 of those caliper bracket bolts. I never had any cross thread. I'd probably just drill and tap a new bolt if I did cross thread one.
This is a source reference. Confirm exact model applicability in the original material.
