Tektro Auriga Twin disc brake piston seal
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Brake Piston seals for Tektro Auriga Twin bicycle disc brake.
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- Creative Commons — Attribution
Use at own risk! Bicycle brakes are critical safety features, tinkering in the shown way definitely voids your warranty and failing brakes can be fatal!
I didn't expect this to work, but it does!
I had a leaking Tektro Auriga disc brake caliper, which upon opening showed heavy use on one of the piston seals. The brakes, being already a little outdated and a mirrored version are hard to find as replacement, so I modeled the seals and printed them in TPU (https://www.dasfilament.de/filament-spulen/tpu-1-75-mm/417/tpu-v2-filament-flexibel-1-75-mm-schwarz-800-g?c=27)
after installing and refilling the brake caliper i was stunned that the brake has a good pressure point and the auto adjustment of the pistons is working. TPU is elastic, mineral oil and wear resistant, so I expect this repair to work for quite some time. But the original seals are definitely a lot softer than the used 94A TPU, so it might be worth trying softer TPU.
The seals have a slightly larger diameter than the dedicated rings in the brake caliper, so squeezing them in is a bit tricky. I used a small screwdriver. When the piston is pushed in the seal, it should need firm pressure but not too hard for pushing by hand.