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  1. #1
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    Formula K24 issues

    I recently got a set of Formula K24's. Before this I had a set of Avid Juicy 3's. I had a ton of issues with the juicy 3's. I couldn't get either of them to stop dragging and on the trail the rear would vibrate the entire bike and make terrible noise. Oh, I am riding a 2009 Giant XTC Alliance by the way. After reading all the issues that juicy 3's have, I just decided to upgrade and get a better set of brakes anyways. Well now I have the Formulas and the same problems exist. I am running 180 on the front and 160 on the rear. The rear still vibrates like crazy and the front squeals terribly. I have readjusted them dozens of times. I have sanded and resanded both rotors and pads. I have taken time to bed them in correctly and still nothing seems to work. Even my bike shop can't figure out what's wrong anymore. I did notice that the pads are hanging over the outer edge of the rotor, could that be an issue? Maybe a wrong adapter? Has anyone had issues with the pads that come stock? Or could it even be the bike? Any and all advice is welcome and appreciated.

  2. #2
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    Can you post some pics??
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  3. #3
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    Here are some pics. Sorry they are not the greatest quality.
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  4. #4
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    Quote Originally Posted by mang5927
    Here are some pics. Sorry they are not the greatest quality.
    I'm not overly familiar with this frame is that a rivet on the seat stay tor the caliper mount??
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  5. #5
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    Yes, actually. It has one that you can see in the picture, then another one on the back. But, the whole mount has been epoxy'd on there with what seems like the same stuff the carbon part of the frame is covered in. I have honestly been kind of skeptical of that mount since after I bought it. Don't understand why they didn't just put one solid aluminum mount on there. It seems like there are some very small gaps where it is "epoxy'd" onto the seatstay. Do you think that could be causing an issue?

  6. #6
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    For your rear vibration issue that is a great source for vibration to come from. My son drills holes into drum cymbals then adds a rivet to keep the sound resonating. You might want to contact Giant about this and see what they have to say.

    As for the front is that the original rotor or a new one?
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  7. #7
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    That's a good point. I think I'm going to take it back to the shop tomorrow and have them deal with Giant for me. The front rotor is what came with the K24s, so it's new. It's not having the vibration issues, just a ridiculous amount of squealing. Maybe it's still getting settled?

  8. #8
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    Quote Originally Posted by mang5927
    The front rotor is what came with the K24s, so it's new. It's not having the vibration issues, just a ridiculous amount of squealing. Maybe it's still getting settled?
    Stock rotors are very thin and can create some wild noises, you might try the Galfer rotors they are thicker. Personally i'v had no issues with them on Avid or Hayes hydro brakes.

    http://www.bti-usa.com/public/manufacturer/GL/BR
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  9. #9
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    sweet, thanks for all the help.

  10. #10
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    Quote Originally Posted by mang5927
    sweet, thanks for all the help.
    Post back on what goes down, have a great week!!
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  11. #11
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    I was going to take my bike in to the shop today but I realized that the back brake was not aligned properly. The outside pad was moving about twice as much as the inside pad and it was pushing the rotor to the outside. I tried to adjust it, but then I realized that the caliper did not have enough adjustment. I pulled off the caliper and also discovered that the mounts are definitely not perfectly parallel. So I decided to go into my LBS and see if they could face the brake mounts. They didn't even know you could do that!!! I was kind of stunned. I'm not sure what to do because I do not have the tool to get it done. Besides that fact that the mounts are not correct, the vibration still continues even after I have a good amount of pressure on the lever. Which makes me wonder still if it could be the frame.

  12. #12
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    If one pad is contacting before the other one it usually means their is a lazy piston. A lazy piston is one that is either not getting sufficient fluid pressure due to design or the piston seals are dry. Hold back the active piston so the lazy one has to make an appearance. Apply caliper lube or brake fluid to the piston then push it back in. Repeat the out and in a couple times until the piston becomes active. Be sure to not pop the piston out of the bore when doing this.
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