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Bike Pulling to one side when braking
#1
Hey. I recently built a gravel bike out of an old mtb and it has been going amazing for the first 200km.

Today out of nowhere I noticed It was pulling to my right when I was braking particularly with the front brake. It's a cantilever braking system and I am running 42mm tires on a 700c wheelset.

It's a steel frame and forks look fine (at leaset true to the eye). I did tighten the headset before I left which is the only think I can think of ?

Any ideas what to do? Wheels run true. I checked both the QR axels were in the drop outs correctly, I have no problem riding no hand and it doesn't pull when doing that.

https://photos.app.goo.gl/jVMq3D7u9bEguaKYA

https://photos.app.goo.gl/PamtxQKYp9JbpikN7
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#2
Looks like you installed the calipers, placing the mounting pin into the wrong plate hole.

Cantilever should be about 2 o'clock.
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