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Disc brakes

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  1. SRD
    Moderator

    My disc brake has been really noisy of late. Started when we had two adults riding - don't know if weight was a factor. First sounded like a leaf or something stuck in it. Then an intermittent rubbing noise. Also a sort of vibrating hum when wheeling it along, but not riding.

    Any ideas? Suppose I had better pop into tbw, but I seem to be in there a lot saying 'its making a funny noise'.

    Posted 9 years ago #
  2. steveo
    Member

    Is the disk straight? I managed to warp a disk one particularly cold morning with a particularly fast stop. Pads might have come out of centre though this usually sorts its self out. Any problems whist braking?

    Posted 9 years ago #
  3. Roibeard
    Member

    I'd opt for a minor adjustment - on my discs (Avid Juicy 3-ish, and Magura Louise), the calipers are attached to brackets which in turn are attached to the forks.

    The caliper to bracket bolts go through oval holes to allow some adjustment.

    I loosen off these bolts, apply the brake, then re-tighten the bolts, all of which ensures the pads are aligned with the discs.

    I've needed to do this about quarterly with the Avid brakes to prevent rubbing or squeaks.

    I'm sure mine are actually meant to self compensate for wear...

    Anyway, usual warnings apply, brakes are safety critical, etc...

    Robert

    Posted 9 years ago #
  4. custard
    Member

    what kind are they?

    Posted 9 years ago #
  5. SRD
    Moderator

    @custard My inability to even answer that question suggests I had better swallow my pride and head across the meadows...

    Posted 9 years ago #
  6. SRD
    Moderator

    TBW says the brake pads were 'shattered'. Thanks all for the advice :)

    Posted 9 years ago #
  7. Roibeard
    Member

    Just goes to show, you should never trust the interweb...

    Good job someone qualified looked at them IRL!

    Robert

    Posted 9 years ago #
  8. steveo
    Member

    Replace the pads was going to be my next guess! :D

    Posted 9 years ago #
  9. neddie
    Member

    OK, so the pistons on my front disc brake seem to be moving unevenly.

    They both move, so are not completely seized, but everything seems to be offset to one side, i.e. one piston is completely in, the other quite a long way out.

    This creates two issues:

    1. The pads cannot be centred on the disc because moving the caliper any further to the side causes it to foul on the spokes.

    2. The pads bend the disc when the brake is applied, causing the disc to rub against the frame/mount. <scream emoji>

    Any ideas on how to fix...?

    (Brake is a hydraulic Tektro Auriga)

    Posted 1 year ago #
  10. I were right about that saddle
    Member

    Oh yes.

    1) Take the system off the bike altogether.
    2) Take the pads out and clean external surfaces.
    3) Clamp the freer piston with a bit of wood.
    4) Pump the stuck piston out as far as you dare using the lever.
    5) Do not pump it out of the caliper.
    6) Clean and lubricate it.
    7) Push it back in.
    8) Repeat with other piston.
    9) If the pistons don't move equally repeat 3) to 8) until they do.

    Posted 1 year ago #
  11. le_soigneur
    Member

    Loosen the mounting bolts of the caliper. (Personally I would take it off, inspect for uneven wear on the brake pads and renew if necessary. There will be a reason they have gone off-centre.)
    You should now be able to centre the caliper as the bolts fix on slots on the fork lugs by pulling on the brake lever.
    Re-tighten.
    Guide linkee

    Posted 1 year ago #
  12. neddie
    Member

    Thanks both.

    The pads were replaced fairly recently, both the new ones and the old ones are/were not unevenly worn.

    The pad replacement was not done by me, but the mechanic took the bike through the back for quite some time (which I was not happy about). This is why I always prefer to do stuff myself - at least then you know what happened...

    Also the mechanic failed to tighten the caliper bolts adequately, as they worked loose shortly after, and I had to retighten, readjust...

    Posted 1 year ago #
  13. unhurt
    Member

    Oh yes.
    1) Take the system off the bike altogether.
    2) Take the pads out and clean external surfaces.
    3) Clamp the freer piston with a bit of wood.
    4) Pump the stuck piston out as far as you dare using the lever.
    5) Do not pump it out of the caliper.
    6) Clean and lubricate it.
    7) Push it back in.
    8) Repeat with other piston.
    9) If the pistons don't move equally repeat 3) to 8) until they do.

    This all sounds very complicated, especially step 1) (and how do I avoid point 5)???)but I fear might be what mine need - the side with the wee-er adjusty wheel seems to not spring back properly when I release the front brake. Result: super annoying faint squeak-squeak-squeak.

    Posted 1 year ago #
  14. I were right about that saddle
    Member

    @unhurt

    Thought you had cables?

    Posted 1 year ago #
  15. unhurt
    Member

    Er. Maybe I have brain reading problems? (But I DO have a squeaky front brake...)

    Posted 1 year ago #
  16. neddie
    Member

    My brake went into permanent-squeak-mode when the caliper bolts came loose. Basically, the whole thing was just floating around on the disc...

    One to watch out for!

    Posted 1 year ago #

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