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  1. #1
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    Side pull brakes

    Hello,

    I took my side pull brakes off a while ago to clean them. It's time to put them back on, but I seem to have some parts left over...

    Firstly, what are these? I have two of them left over.

    100_3825_zps3e3d172c.jpg

    (ignore the white dust. I was a little enthusiastic with the car wax).

    They have a flat side, but the opposite side is ridged. It's ridged in the same way the "main" caliper bolt is ridged.

    Also, what are these (two of these left too)?

    100_3826_zps722df403.jpg

    I know that they go next to the frame, but is this on the front or rear brake (or one on each)?

    Finally, do I put this flat against the frame?

    100_3828_zps967508e4.jpg

    ...or does something else go inbetween?
    Last edited by Fumbles22; 02-07-14 at 09:28 AM.
    My bike: http://i116.photobucket.com/albums/o22/mmmbop_01/100_3807_zps584935e2.jpg

  2. #2
    Andrew R Stewart Andrew R Stewart's Avatar
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    First photo is of the center bolt's (the mounting to fork bolt) spacers. Some set ups need to have the caliper further away from the fork then others. these spacers allow this. Generally at least one is used most all the time.

    Second photo is much the same but has the one side curved to better fit against a fork crown that is also curved. If the fork crown is flat at the brake mounting hole then this curved spacer is not needed. The rear brake has the same but it's curved spacer has a tighter curvature as the brake bridge is a smaller diameter tube then the crown might be.

    Third photo- Typically a spacer is placed both in front and behind the fork crown, curved spacer if the crown is also curved, flat if the fork is flat. These spacers allow the caliper to fit the fork better and more solidly. Andy.

  3. #3
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    I'm told the 'one side curved' thing is called a 'half moon washer' and it needed on rear brakes that have flat center bolts and flat nuts and washers tightened down on a round tube bridge. The two half moon washers provide the interface between the round bridge and the flat bits clamping around it. Distributes the clamping force to protect the frame tube. I've seen bikes that have no half moon washers and the brake bridge between the seat stays is a bit mashed - a shame. 'Bracket' the rear bridge with the two half moon washers and snug things up. Oh, Dave Moulton has a nice entry on his blog site about centering the side pulls when you install them. worth a read.

  4. #4
    coprolite fietsbob's Avatar
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    large arc half moon washers are for the fork , smaller radius ones are for a plain round tube seat stay bridge

    since tubes are round and the brake and nuts are flat , you need pairs front and rear of both

    your front brake may neet those other spacers the flat faced one to get clearance around the headset lower,
    for things like racks or at least the reflector mounts.

    toothieness will keep brake caliper somewhat .. centered..
    Last edited by fietsbob; 02-07-14 at 11:21 AM.

  5. #5
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    Look for scars in the paint and\or polished parts to see where the serated part of those spacers went. Use them as a clue to where they are supposed to be.
    And clean all that grease off the caliper. All it will do is make dirt stick.
    If you don't know the way, you shouldn't be going there.

  6. #6
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    The others have answered the specific questions, so here are some general rules for the fuure.

    1- any serrated washers or spacers are to improve traction between the brake and frame or fork, or within a washer/spacer stack.
    2- thich washers, are really spacers designed to move the brake away from the frame or fork, usually to increase brake shoe clearance
    3- curved (one side) washers are to mate the brake to a curved surface like you'd fine on the fork or seat stay. The curvature has to match what it fits against.

    Now to avoid errors when taking apart things (anything) one is not familiar with.

    The key to working with the unfamiliar is the same as walking to Grandmothers house through unfamiliar woods. Leave bread crumbs so you can find your way back along the same path.

    1- take a digital before photo (or more than one), hopefully showing any spacers, washers, seals etc.
    2- lay parts on a paper towel in the sequence and orientation as they come off, so you can reverse the sequence as you put it back together.
    3- Take a photo of the parts laid out in case a critter eats your breadcrumbs, or you knock them all off onto the floor, or want to wash them.
    Last edited by FBinNY; 02-07-14 at 12:39 PM.
    FB
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    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

    “One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

  7. #7
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    Quote Originally Posted by FBinNY View Post
    The key to working with the unfamiliar is the same as walking to Grandmothers house through unfamiliar woods. Leave bread crumbs so you can find your way back along the same path.1.
    Unfortunately, for some people it's like Hansel and Gretel, they left a trail of bread crumbs but the birds ate them.

  8. #8
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    Quote Originally Posted by HillRider View Post
    Unfortunately, for some people it's like Hansel and Gretel, they left a trail of bread crumbs but the birds ate them.
    Yes, but these days they can use technology to record a series of GPS datapoints. That's why I suggested memorializing the laid out in sequence with digital photos.

    Another thing people can do when wotking on things like brakes where they have two, is to do only one at a time, so they have the other as a model in case they get lost.
    FB
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    An ounce of diagnosis is worth a pound of cure.

    “Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

    “One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

    WARNING, I'm from New York. Thin skinned people should maintain safe distance.

  9. #9
    Ride More seedsbelize's Avatar
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    Love the user name. Logically speaking, mine should be mittens.

    Life is is too short to care what others think of your bike.

  10. #10
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    I think i've put them in properly. I followed fietsbob and put the half moon washers on the front fork.

    your front brake may neet those other spacers the flat faced one to get clearance around the headset lower,
    for things like racks
    I also applied this, but to my back brake. I have a luggage rack that fits onto the brakes so I used the order (excluding the calipers) luggage rack - spacer - frame - spacer - nut. I put the ridged end of the spacer up against the frame to hold it in place (thanks leob1!).

    The key to working with the unfamiliar is the same as walking to Grandmothers house through unfamiliar woods. Leave bread crumbs so you can find your way back along the same path.

    1- take a digital before photo (or more than one), hopefully showing any spacers, washers, seals etc.
    2- lay parts on a paper towel in the sequence and orientation as they come off, so you can reverse the sequence as you put it back together.
    3- Take a photo of the parts laid out in case a critter eats your breadcrumbs, or you knock them all off onto the floor, or want to wash them.
    I actually did this! I watched an episode of Wheeler Dealers on Discovery and he did the same thing. He took digital photos and videos, but he also sellotaped the nuts and bolts to pieces of paper with labels on them.

    When I did it, I put all the pieces in a line in the order they were removed. Unfortunately, I couldn't see which washers were washers and which were half moon washers. I also had the calipers separately (the car wax on them was drying). I also forgot where the frame went too. If I was doing it again, i'd take photos of them on the bike as well.

    Also, I forgot which "main caliper bolt" (the one with the bolt that the spring goes onto) went with which brake. I ended up messing it up and I was trying to put the shorter rear one on the front and vice versa. It took me some time to figure it out.

    I haven't put the brake cables on yet (i'm waiting for the levers and brake blocks to arrive) but I think i've done it right.

    Love the user name. Logically speaking, mine should be mittens.
    Thanks, I got it from Robot Chicken https://www.youtube.com/watch?v=DW3dg9VURMU
    My bike: http://i116.photobucket.com/albums/o22/mmmbop_01/100_3807_zps584935e2.jpg

  11. #11
    Senior Member Thumpic's Avatar
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    Pics.....pics...pics...pics.... I always take beaucoup pics of my bikes before/during/after rehab. It's easy and cheap back up info for times like this.

    I also save pics and schematics that the resident experts are kind enough to post in this forum on occasion. Somewhere I have a bookmark to the Shimano tech docs sight; great reference information.
    Last edited by Thumpic; 02-08-14 at 02:01 PM.
    Thumpic....

    Green is the new "CHEAP"

  12. #12
    Senior Member CustomSteel's Avatar
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    Digital pictures really are your best friend when disassembling and reassembling anything on bikes, cars, etc.

    I use ziploc bags to keep parts in, with appropriate labels when necessary.

    In the case of the brake parts, you can loop a wire or string through the hardware so you can keep them in order while they are off the stem for the brake arms.

    The washer with the curved side, that has been identified as a half moon washer, is indeed for the front side of the fork.

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