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Thread: Disc Brake

  1. #1
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    Hey,

    Yes, I have a Dept. Store Bike, just to get that out of the way, it's a Mongoose XR-200. Front Disc and the rear is standard brakes (V)

    I need to know WHY my front brake drags like hell, and it squeaks like there is no tommorow. I squeeze and it makes a loud screech. I have no idea what it is, I rubbed it down several times with Isoproypl Alc. 70% and it's still screwy.

    Help me?

  2. #2
    Lost in the Black Hills mx_599's Avatar
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    Quote Originally Posted by DaemonLee
    Hey,

    Yes, I have a Dept. Store Bike, just to get that out of the way, it's a Mongoose XR-200. Front Disc and the rear is standard brakes (V)

    I need to know WHY my front brake drags like hell, and it squeaks like there is no tommorow. I squeeze and it makes a loud screech. I have no idea what it is, I rubbed it down several times with Isoproypl Alc. 70% and it's still screwy.

    Help me?
    is rotor true?

    can you adjust to allow pads to retract?

    can you shim caliper to allow for more equal spacing on each side of rotor?

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    Let me be a little more specific, I am a total n00b to bikes. I have no idea what a rotor is, but I do know that there is a red knob on the ProMax caliber. It moves to both sides, front and backwards and has a sticker on it, basically stating 'DON'T **** WITH ME' and towards the wheel, there is two levers, small, one is blue and the other black. They both click.

    I do believe the rotor is 'true' due to I took it in to Aaron's Bicycle Repair and they did a full tune-up on it.

  4. #4
    Lost in the Black Hills mx_599's Avatar
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    Quote Originally Posted by DaemonLee
    Let me be a little more specific, I am a total n00b to bikes. I have no idea what a rotor is, but I do know that there is a red knob on the ProMax caliber. It moves to both sides, front and backwards and has a sticker on it, basically stating 'DON'T **** WITH ME' and towards the wheel, there is two levers, small, one is blue and the other black. They both click.

    I do believe the rotor is 'true' due to I took it in to Aaron's Bicycle Repair and they did a full tune-up on it.
    disc true?

    start messing with the knobs until you get less rub and noise. its the only way to learn.

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    Okay, the Resistance went away, but now, everytime I still squeeze the brake, it screeches like hell.

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    Lost in the Black Hills mx_599's Avatar
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    Quote Originally Posted by DaemonLee
    Okay, the Resistance went away, but now, everytime I still squeeze the brake, it screeches like hell.
    maybe buy some automotive brake/contact cleaner from an Autozone/Checker place and clean your disc and spray onto the pads to clean them too. this may or may not help. rubbing alcohol is lame. i am not sure why this is so prevalent among bicyclists.

    at one time or another it had to have been mentioned by someone in a magazine or something and people freakin' took off running with it.

  7. #7
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    Now, sorry that I forgot to include this orginally, but it's a Cable-actuated Disc Brake, not Hydrualic. Do the Disc Brake ones apply pressure or apply pads to the disc?

    I used it, because it was recommended in the manual that came with the bike. *sigh* Good ol' Pacific Cycle!

  8. #8
    Lost in the Black Hills mx_599's Avatar
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    Quote Originally Posted by DaemonLee
    Now, sorry that I forgot to include this orginally, but it's a Cable-actuated Disc Brake, not Hydrualic. Do the Disc Brake ones apply pressure or apply pads to the disc?

    I used it, because it was recommended in the manual that came with the bike. *sigh* Good ol' Pacific Cycle!
    you did the right thing...lots of manuals suggest alcohol. in fact, i am waiting for some alcohol happy cyclist to jump all over my suggestion. you don't have to be a sheep. people write manuals...the same people who are haplessly enamored by alcohol and its use on bikes.

    you do want to use precaution with brake cleaners. it can be powerful stuff. some worse than others. watch where you get it...but most surfaces are fine.

    usually the cable disc brakes still have pads. the inboard pad is often stationary and the outboard pad is the one that moves. clean them all.

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    Hey, mx_559, when you have a minute, can you hop on MSN or something then you can help me out with something? I want to take a closer look at my Disc Brake.

  10. #10
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    Okay, I'm wrong. What I did figure out, if that they are normal disc brakes, and that I might need new pads. *sigh* and they're really cute. They look like slices of a normal brake pads on miniature pizza handlers.
    Last edited by DaemonLee; 02-19-06 at 04:29 PM.

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    Okay, now my question is this;

    I started fiddling and noticed that my Pads were COMPLETELY smooth, and I checked images of the 'new' ones and they're rough. Is this a problem?

    Also, I can only remove one pad holder. The other one, no matter which way I move it, will not come out. It's in there. Any ideas?

    edit:// btw, the tire has been removed via QR.

  12. #12
    Lost in the Black Hills mx_599's Avatar
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    Quote Originally Posted by DaemonLee
    Okay, now my question is this;

    I started fiddling and noticed that my Pads were COMPLETELY smooth, and I checked images of the 'new' ones and they're rough. Is this a problem?

    Also, I can only remove one pad holder. The other one, no matter which way I move it, will not come out. It's in there. Any ideas?

    edit:// btw, the tire has been removed via QR.
    i don't know about them being rough or smooth, but you should be able to tell if they need to be replaced if the thickness is significantly reduced. not sure about the stuck one?

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    In MSN, we were talking about how one would constantly move each time I squeezed the handle, that one will come out. The other, will NOT. It stays in, It will come out of it's groove, but not out of the Disc Brake area, about 2mm away from it's groove, probably.

    I think the screech is caused by some soap that got in there, so the best cause would be to leave them in there and then goto my LBS and get some new pads. Atleast the brakes still work.

  14. #14
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    the sqeaking is caused by little grains of sand or what not on the rotor or pad, and it sqeaks, alcohol just removed it

  15. #15
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    Well, I would normally agree with you, but I actually think the DISC isn't true, because I see a little 'wobble' each time I spin it.

  16. #16
    Lost in the Black Hills mx_599's Avatar
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    Quote Originally Posted by DaemonLee
    Well, I would normally agree with you, but I actually think the DISC isn't true, because I see a little 'wobble' each time I spin it.
    i asked you that like 8 hrs ago

    take an adjustable wrench and tweak it true

  17. #17
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    How do you do that? Give me some instructions.

  18. #18
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    Quote Originally Posted by DaemonLee
    How do you do that? Give me some instructions.
    its better if you even use 2 adjustable wrenches sometimes. just spin the wheel and look for where the rotor is out of "true". adjust the wrench/s to about 2mm or the thickness of your rotor and put the wrench over rotor at the out of true spot and tweak it back gently. ie, bend in the opposite direction a little. do a little at a time and keep re-checking the rotor by spinning the wheel

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