at wit's end

Discussion in 'Motorized Bicycle General Discussion' started by crassius, Jun 25, 2015.

  1. crassius

    crassius Well-Known Member

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    built a nice huffy fresno with the 12ga spokes

    front brakes squeal VERY loudly

    trued wheel & cleaned rim with carb cleaner - no improvement

    toed in the pads - no improvement

    toed out the pads - no improvement

    swapped pads from silent rear wheel - no improvement

    replaced pads with new by diff manufacturer - no improvement

    re-trued wheel and turned on stand for a while while sanding rim and installed wheel to run in reverse direction - no improvement

    drove for over a mile dragging brakes to see if pads would wear in, POed my neighbors, but - no improvement

    What am I missing here?
     
  2. Davezilla

    Davezilla New Member

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    What type of brake calipers are you using? It could be the calipers or V brake arms chattering causing the squeel... I would look at the brake arms and either replace with something more rigid or get creative with some RTV in places it can't be seen to help dampen out that vibration or resonance that's causing the squeal. Also, if it's a V brake setup you might just need to swap out the plastic bushings and those teflon washers etc...
     
  3. wheelbender6

    wheelbender6 Active Member

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    Try sanding or grinding the face of the pads. It works sometimes.
     
  4. crassius

    crassius Well-Known Member

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    forgot to mention I sanded all pads - will look more closely at arms & maybe try rear arms on front
     
  5. LandSpeedRecord

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    Very slight toe in and an old trick is rub the rim with dry dirt on your finger tips. Crazy but it works.
     
  6. crassius

    crassius Well-Known Member

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    crazy may be where I'm going with this soon

    noticed arms were loose & could wiggle even when brake was grabbed tight - took em off & found the brass tubes were not set out enough to take up slack between spring housing & arm - used a drift to reseat tube in arm until with arm installed there was a slight drag when moved (no wiggle even when released)

    no improvement again

    have another used set of black arms that were scratched up - painted and will try with them when they dry tomorrow

    not sure I'll try dirt, as I have mostly sand & damp soil here, but I have a pair of new chrome arms that I may try (and then have to buy matching for rear)

    tomorrow will be fifth day working on this bike that I only hope to make $100 on : (
     
  7. crassius

    crassius Well-Known Member

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    swapped rear arms to front while waiting for paint to dry - no improvement

    paint dried (& looks like painted by old people) - arms are about 4mm thicker at pad mount point (had to remove the large alignment spacer because pad posts are way too short to make that extra 4mm mount) - brakes are silent now : )

    arms are so much shorter that cable drags on fender with fender mount as low as possible & a bit of extra bend applied to fender, but they return OK & work well so good enough

    will save these china arms for possible use on rear of something since they were silent there

    may stop buying boxed bikes so I can listen to brakes at the store (altho I was about to order 3 magna bikes over inet today)
     
  8. Davezilla

    Davezilla New Member

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    That's what I was thinking since a lot of the arms are now being made from stamped steel so they can vibrate and make noise, all my bikes that have the rigid alloy arms brake quietly all the time e but some of the newer ones that came with the stamped steel arms not only squeal but also have a more spongy feel to them since they also flex a little when brakes are applied hard. The alloy arms are more rigid so they have a better feel to them as well.
    I've since switched to hydraulic disc brakes up front since I can get them cheap enough, these are a lot stronger than the mechanical disc brakes and always quiet. The last hydraulic caliper and lever setup costed me just over 30 on ebay and the extra stopping power is well worth it so I try to find bikes that already have a front disc brake if I can, but I've had a a lot better luck with the V brakes that have the more rigid alloy arms, they're quiet, they don't wear out the pads as quickly, and they will flip the bike if pulled on too hard...
     

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