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2021 Serial 1 Mosh/CTY
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23 Posts
Discussion Starter · #1 · (Edited)
The last time I bought a new bicycle was in the 1980's. It's a no-suspension mountain bike. (Bicycles didn't have suspensions or disk brakes back then.) I still have that bike. But my point is, I have absolutely no experience with disk brakes on bicycles. It turns out, I was supposed to "bed in" my new brakes. I had no idea.

So my brakes on my brand new Mosh squeak. OK. No biggie. By day 2, they squeak loudly. And I mean LOUD. I literally scare pedestrians if I apply my brakes near them. I caused a couple walking their dogs to nearly jump out of their skin yesterday. They thought they were about to get run over by a giant truck! Nope. It was just me, on my Mosh.

So I contacted Serial 1 Support. This is the reply:

These brakes are brand new, so they need to be bedded in. It's a pretty simple process, and we have it right here for you:​
For best bed in procedure we recommend the following.​
1. Pedal around with the brake slightly engaged to get pad compound onto rotor letting on and off occasionally. Do this for 5 or so minutes.​
2. Pick up speed and brake harder but not coming to a complete stop. do this 10-15 times.​
3. First ride we find it beneficial to modulate the brake on and off like step two for 5-10 minutes.​
Basically you are getting the pad compound onto the rotor without over heating the pads.​
After this you should be good to go!​
If this doesn't work for you, please let me know, but I think you'll be just fine after the following the procedure.​
Hope you really enjoy your new bike!​

Upon further investigation, I discover that this is in fact very necessary, and according to cyclingtips.com I may have permanently damaged my rotors, and will have to replace them:


I suggested to Serial 1 Support that they include a note in the manual or a flyer or a video about the need to bed in your brakes.

End public service announcement...
 

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2021 Serial 1 Mosh/CTY
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Discussion Starter · #2 · (Edited)
Welp the brakes have only gotten worse. I tried doing the bed in procedure (several times) and adjusting the caliper position to center the brakes, all after the damage was done. The rear brake still squeaks like a garbage truck, and the front grinds and scrapes and feels like it's going to explode. Yeah, maybe if I remove the rotors and sand them, I can correct this, but I just spent $3400 on a new bike. I wanted to ride it, not work on it from the start. I have to say, this has soured my enthusiasm a bit.
 

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2021 Serial 1 Mosh/CTY
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Discussion Starter · #3 ·
OK after the initial back and forth, and perhaps miscommunication on my part, Serial 1 Support stepped up and took action. The support rep called a local bike shop in my area to see if they could take a look at it, and offered to pay the bill. I took it there and they first tried cleaning the rotors and sanding the pads with no improvement. Then they just replaced the pads. Then the brakes ran quiet. Serial 1 paid the bill.

Since then they have started squeaking a bit, but not at garbage truck decibel levels, and mostly just when they are cold.
 

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2021 Serial 1 Mosh/CTY
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Discussion Starter · #4 ·
Serial 1 now has a video up on their YouTube channel on how to do the brake bed-in:

 
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