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I have an Tektro Auriga Comp Hydraulic Disc Brake System. It's been running worry free for ~10 years.

But now I need to replace the rear disk brake pads (for only the second time). However the 3mm allen key holding the pads in place had rounded off. i.e. Meaning I could not take it out with an allen key. Instead I had to drill it out with a bolt extractor.

I'll need to replace this bolt but I'm not sure what it's called.

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Does anyone know the name of this bolt? Alternatively can it be replaced by a different type of bolt?

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    I’m amazed you only needed to replace the pads twice in 10 years. – Argenti Apparatus Jan 23 at 14:39
  • I would have expected to change them more. I also expected to change the Hydraulic brake oil every 2 years. But I've never needed to do that. When the brakes felt sponge I checked the pads, noticed they were low, replaced them, and that fixed the issue. – Shane Gannon Jan 23 at 15:09
  • Technically you do really need to replace the fluid through a proper bleed process after 10 years. Tektro uses mineral oil I believe which does not absorb moisture. This means there is likely some water sitting in your calipers which will boil if you get in a heavy braking situation an heat the calipers up a lot. Personally I'd have them bled for peace of mind. – Argenti Apparatus Jan 23 at 17:54
  • I was unaware of that. I assumed I'd feel the difference. I already have the parts and it looks fun to do. Good suggestion. – Shane Gannon Jan 23 at 19:36
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    As there is no load on the pin, you could use a split pin for retaining the pads. (Many brakes do, some Shimano come with a split pin but have threads in the caliper for a retaining bolt) – mattnz Jan 23 at 20:53
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This part is generally called a "brake pad retaining bolt" or often only "retaining bolt". They differ between brake brands and sometimes models, but a quick search for your brake model and "retaining bolt" usually turns up the right part.

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You’ll need to get the correct part from Tektro. I believe Tektro calls those bolts a ‘pad axle’. They have a parts list pdf that you can download from their website. If you can’t find your model calipers there you can probably find a contact email address or phone number.

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