Disc brakes

Discussion in 'Cycling Archive' started by soup, Oct 20, 2015.

  1. soup

    soup Guest

    I am about to receive a new bike that has hydraulic disc brakes. Now I
    have never used disc brakes before, I have been watching lots and lots
    and... of Youtube videos on adjusting/maintaning/setting up disc brakes
    and apart from the bleeding they seem much easier and less temperamental
    than standard rim brakes. Is there anything I should be on the look-out
    for or are they really as simple as they seem?
    Seems a lot of videos are on cleaning the rotors and pads to stop
    squealing are disc brakes really bad for this or have I just ended up in
    a corner of YT that makes them seem this way?

    Also I build computers, so have Isopropanol (Isopropyl Alcohol) lying
    about can I use this as brake cleaner (for the rotors) or am I better of
    investing in specific brake cleaner (which I believe is just IPA with
    propellant).
     
    soup, Oct 20, 2015
    #1
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  2. soup

    Mike Causer Guest

    Ditto, ditto. The bottom-line Avid disk brakes on my Airnimal don't
    squeal often, but can be useful when they do. A couple of semi-hard
    aplications makes the squeal go away.

    Somewhere (TM) I've got the internal Girling document on why brakes do
    that, and how to stop it at design time. But I left there over 40 years
    ago and canne unforget.







    What was the question again?


    Mike
     
    Mike Causer, Oct 20, 2015
    #2
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  3. I change pads every now and then, thus far thats about it.

    my wife who is a slower rider than I and rather gentle braker, gets
    polished pads, though we are going to try getting a spare seatpost and
    saddle so I can rough it up once a month or so.

    roger Merriman
     
    Roger Merriman, Oct 21, 2015
    #3
  4. soup

    Tosspot Guest

    They'll likely take a few miles to come up to scratch.
    Never bothered with mine much. Be careful when messing about with the
    chain, the discs acquire a magnetic attraction. Leave 'em alone! The
    pads will likely last 4,000 miles commuting, less downhilling!

    Bleeding isn't hard, but can be intimidating first time. If they have
    DOT 5.1 careful of paintwork.
     
    Tosspot, Oct 21, 2015
    #4
  5. In uk.rec.cycling.moderated on Tue, 20 Oct 2015 22:53:58 +0100
    My Avids squeal horribly when wet and for a bit of time while drying.
    A couple of hard applications and the odd bit of dragging shuts them
    up.

    But they are never quiet... there's always some noise.

    Zebee
     
    Zebee Johnstone, Oct 21, 2015
    #5
  6. soup

    Danny Colyer Guest

    AIUI it'll be fine, but I haven't tried it. Generally just be really,
    really careful about what gets on the rotor. Unwanted stuff on the
    rotor can irretrievably contaminate the pads.

    I accidentally got WD40 on one of my rotors (I don't remember now where
    I was supposed to be squirting it, but I had just hosed the bike down
    and wanted to disperse water from various places). I thought it would
    probably be OK if left to evaporate, but it wasn't. After cleaning with
    disk brake cleaner the performance was similar to that of a V-brake the
    morning after a wet ride, with the addition of lots of squealing.

    On the plus side I promptly thereafter learnt how to replace disk brake
    pads, which was easy.
     
    Danny Colyer, Oct 21, 2015
    #6
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