Cervelo Aspero, swapping front disc brake caliper. Got both bolts out, and while putting the bottom bolt in, hit a lot of resistance. I made sure it was straight, no cross threading, and still couldn’t get it to thread in, even the old bolt! I have an m5 tap that I ran to chase the threads, and got a good bit of shavings (it was doing more than chasing the threads, more like dust with some grease and Loctite mixed in)
I’ve pulled calipers before but never run into something like this before. (Sure there was resistance coming out, but I figured it was Loctite) Sweating bullets the whole time, added more Loctite on the new bolt, which threaded in securely.
Can’t figure out what could have happened. The bolt, old or new, threaded in about half way and got the resistance, like it was jamming. Was the original install done poorly? It came out, didn’t seem to want to go back in. There was some raised aluminum around the hole edge. Someone at the factory use an impact driver on it maybe?
What model year Aspero, brand of brakes, direct or flat mount bracket? Unless it’s an identical model of caliper there is a chance the bolt lengths are different.
maybe a helicoil partially came out? (“There was some raised aluminum around the hole edge”)
I had this once with a cannondale and a lefty fork. The 1 bolt that holds the wheel to the fork came out, partially with the helicoil, but I didn’t saw that. When screwing it back in, I mashed the helicoil back in the fork, and it got stuck and totally screwed..
since I never heard of a helicoil I was in in a total panic, thinking I ruined my 2 weeks old bike Got it to the shop and the installed a new coil, worked as it should from then on.
GRX 700 to 820 caliper. (Wondering why I did that Wanted all 800 series)
Adapter mount plate used. Probably pretty common. I checked it this morning and it’s holding firm. It was just weird.
Another strange (?) part is they used a rubber tube, to stop rattle/knocking, that made pulling new hose ‘challenging’. I’m glad I bought the Park internal routing kit. The double barb small tool is Priceless!! I taped the hose together, and there was no way to get it through, and surprisingly, it did not urge that rubber damper to show itself.
This has been an experience, and it’s not done yet.
Got it to the shop and the installed a new coil, worked as it should from then on.
Wanted all 800 series)