Glazed pads

bobbydigital
bobbydigital Posts: 254
edited March 2018 in MTB workshop & tech
You will probably say upgrade the brakes but I have a set of Shimano 396's brakes and no matter what I do they squeel.

I've changed pads, discs, tried cleaning, sanding pads and discs.
Bled them with shimano oil, solid lever feel, no more air coming though.
Allowed pistons to come out during bleed to squeeze any air out.
Bought disc cleaner.
Pedaled with the brakes slightly applied to heat them up.
Done heavy braking cycles.
Calipers are m447's

Rear one has always had issues but now the front is doing it.

v6Y55RD.jpg


Is this an issue with early Shimano brakes?
Pain in the butt, the noise is embarrassing :lol:

Comments

  • cooldad
    cooldad Posts: 32,599
    Stop putting random faffing and putting crap on your brakes and try soft pads, organic or kevlar.

    ps thats a pic of a rotor, not a glazed pad?

    Do you drag your brakes?
    I don't do smileys.

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  • bobbydigital
    bobbydigital Posts: 254
    I put the disc pic as I wasn't sure if it looked normal.

    Pads glazed but clean up with Isopropanol alcohol, work for a while then start to scream. It was with B01S resin pads.

    EaAz606.jpg

    I tried dragging the brakes but will need ear plugs for round 2.
  • The Rookie
    The Rookie Posts: 27,812
    Dragging the brakes is the worst thing you can do, nice hard stops, about ten in a row.

    Resin pads are bad for squealing at this time of year as they absorb moisture.
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.
  • bobbydigital
    bobbydigital Posts: 254
    Bloody hell I have like 15 pairs of those B01S pads, will have to invest in to some other compounds like suggested.

    I've seen people apply the brakes and pedal until the squealing stopped but I'll go for the new compound and see what happens, and the moisture thing makes senses, they would work for a while, a few muddy rides, hose down and they wouldn't be happy.
  • cooldad
    cooldad Posts: 32,599
    Just clean the rotors with IPA, fit new pads and ride.

    Don't mess with them.

    I've had just about every version of Shimano brakes since they started making them. Never done anything to any of them except normal bike cleaning. A good hose with clean water is all they ever need.

    Some pads squeal under certain conditions. Find ones that work for you. I hate sintered. Other people may differ.

    I don't even bother with bedding in. Just ride to the top of a decent trail, ride down braking normally and they've always been fine.
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

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  • swod1
    swod1 Posts: 1,639
    Dragging the brakes is one of the worst things you can do when bedding in brake pads.

    As already stated i just do a few hard stops and brakes been fine.

    I'm using semi metallic on my bike and haven't had any issues. the only pads i don't use are kevlar just couldn't get them to bed in properly.
  • slc123
    slc123 Posts: 407
    I recently fitted some new semi metallic pads to my Guide R brakes. Few hard stops and also absolutely fine. Rode them for a weekend on black runs with no issues.
    Cannondale Trail 27.5 | 2015
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  • eric_draven
    eric_draven Posts: 1,192
    The Rookie wrote:
    Dragging the brakes is the worst thing you can do, nice hard stops, about ten in a row.

    ^^^This^^^
  • swod1
    swod1 Posts: 1,639
    I also stopped using shimano resin pads as these just easily glazed and made noise. switched to aftermarket pads and no issues. only noise now is in really wet conditions.

    I'd be tempted to change the rotors to something else as the ones used with low end shimano brakes aren't the best and are usually stamped resin only.
  • bobbydigital
    bobbydigital Posts: 254
    Keep away from the resins then!

    I got some 506 and 516 brakes, 1 finger ones so might try them and see if they are easier in the long run.
  • JBA
    JBA Posts: 2,852
    They are Deore brakes. Excellent value and performance so shouldn't be a problem. I have them on my hardtail and they work very well.
    Bed the pads in properly and they will be fine*. All brakes squeal at times, especially in the wet so don't fret about it tooo much.

    *The method that works for me is:
    - Ride at walking pace and slam on brake.
    - Repeat 10 times for each brake.
    - Ride at a decent pace (10mph-ish) and slam on brake.
    - Repeat 10 times for each brake.
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