Mountain Bikes · Public discussion

Retracting brake pistons

Started by Duncan · · Last activity · 4 posts · 818 views

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Mountain Bikes
Published
10 July 2005
Last activity
11 July 2005
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Duncan
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  1. Hi,
    I have a set of Hayes Nines. I've just worn my way through a set of pads
    and discs[1] and replaced and installed a new set.
    I can get the pistons to retract enough to fit the new discs and pads but
    not enough for them to spin freely.
    It's my understanding that when the lever is open the fluid is able to flow
    back into the reservoir. I've tried wedging a screwdriver[2] between the
    pads to hold them apart and left them overnight but when I remove it there
    is always a bit of spring back to their original position.
    Are there any tricks to getting them to retract further? It would make
    sense to me to open the bleed valve briefly while they're held apart but I'm
    not so sure so thought I'd ask for other options.

    Cheers,
    Duncan.

    [1] Not very impressed to only get 3000 km out of the pads and discs. The
    discs may have lasted a while longer but they had hit their service limit.
    [2] A degreased and quite wide screwdriver so as not to damage the pads.

  2. "Duncan" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    Hi,
    I have a set of Hayes Nines. I've just worn my way through a set of pads
    and discs[1] and replaced and installed a new set.
    I can get the pistons to retract enough to fit the new discs and pads but
    not enough for them to spin freely.
    It's my understanding that when the lever is open the fluid is able to
    flow
    back into the reservoir. I've tried wedging a screwdriver[2] between the
    pads to hold them apart and left them overnight but when I remove it there
    is always a bit of spring back to their original position.
    Are there any tricks to getting them to retract further? It would make
    sense to me to open the bleed valve briefly while they're held apart but
    I'm
    not so sure so thought I'd ask for other options.

    Cheers,
    Duncan.

    Remove the pads and lever / push on the piston with a 10mm box wrench.

    http://www.hayesdiscbrake.com/pdf/General-45-14575BEnglishWeb.pdf

    --
    DTW .../\.../\.../\...

    I've spent most of my money on mountain biking and windsurfing.
    The rest, I've just wasted.

  3. "D T W .../\..." <[email hidden]> wrote in message
    news:YsaAe.5198$rx4.513@trndny05...

    Quoted message said:

    "Duncan" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    Hi,
    I have a set of Hayes Nines. I've just worn my way through a set of


    pads

    Quoted message said:
    Quoted message said:

    and discs[1] and replaced and installed a new set.
    I can get the pistons to retract enough to fit the new discs and pads


    but

    Quoted message said:
    Quoted message said:

    not enough for them to spin freely.
    It's my understanding that when the lever is open the fluid is able to
    flow
    back into the reservoir. I've tried wedging a screwdriver[2] between


    the

    Quoted message said:
    Quoted message said:

    pads to hold them apart and left them overnight but when I remove it


    there

    Quoted message said:
    Quoted message said:

    is always a bit of spring back to their original position.
    Are there any tricks to getting them to retract further? It would make
    sense to me to open the bleed valve briefly while they're held apart but
    I'm
    not so sure so thought I'd ask for other options.

    Cheers,
    Duncan.

    Remove the pads and lever / push on the piston with a 10mm box wrench.

    http://www.hayesdiscbrake.com/pdf/General-45-14575BEnglishWeb.pdf

    Thank you. It seems the trick was the walking them in side to side. All my
    efforts were a little lop sided while the pad was still in and they weren't
    going as far as they could.

  4. "Duncan" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    "D T W .../\..." <[email hidden]> wrote in message
    news:YsaAe.5198$rx4.513@trndny05...

    Quoted message said:

    "Duncan" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    Hi,
    I have a set of Hayes Nines. I've just worn my way through a set of


    pads

    Quoted message said:
    Quoted message said:

    and discs[1] and replaced and installed a new set.
    I can get the pistons to retract enough to fit the new discs and pads


    but

    Quoted message said:
    Quoted message said:

    not enough for them to spin freely.
    It's my understanding that when the lever is open the fluid is able to
    flow
    back into the reservoir. I've tried wedging a screwdriver[2] between


    the

    Quoted message said:
    Quoted message said:

    pads to hold them apart and left them overnight but when I remove it


    there

    Quoted message said:
    Quoted message said:

    is always a bit of spring back to their original position.
    Are there any tricks to getting them to retract further? It would make
    sense to me to open the bleed valve briefly while they're held apart
    but
    I'm
    not so sure so thought I'd ask for other options.

    Cheers,
    Duncan.

    Remove the pads and lever / push on the piston with a 10mm box wrench.

    http://www.hayesdiscbrake.com/pdf/General-45-14575BEnglishWeb.pdf

    Thank you. It seems the trick was the walking them in side to side. All
    my
    efforts were a little lop sided while the pad was still in and they
    weren't
    going as far as they could.

    Yes, It's easy after you've struggled for a while. Here's another good
    info site from Slack.

    http://www.pbase.com/slack/hayes_brakes

    --
    DTW .../\.../\.../\...

    I've spent most of my money on mountain biking and windsurfing.
    The rest, I've just wasted.

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