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Avid Single Digit 7 V-brakes losing pads

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Avid Single Digit 7 V-brakes losing pads

Old 07-31-15, 08:03 PM
  #1  
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Avid Single Digit 7 V-brakes losing pads

We have Avid Single Digit 7 V-brakes on our 2003 tandem, probably original equipment. In the last year they've lost three pads. I've lost both Koolstop and SwissStop pads. My theory is that the pins gradually work their way up and out of the holder. Then the pad comes out of the holder either when I apply the brakes to hold us in place on a steep uphill or when I'm holding the bike in place while Stoker clips in. I've been very curious about how this happens. We just got back from a very long ride which featured some long steep descents, and I found one pin halfway out of its holder where it's been happy for months.

I'm very careful to insert the pins as far as they go, and they come out the bottom hole in the holder like they're supposed to. However the pins don't have a positive insertion: it's always possible to pull them out with a needle nose when changing pads.

I've asked my LBS and they have no ideas. It's impossible to communicate with SRAM.
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Old 07-31-15, 08:55 PM
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I've replaced the pins on my pads with garden-variety safety pins.

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Old 07-31-15, 10:20 PM
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^That's a good idea. I happen to have quite a pile of what are probably the right size from pinning numbers on jerseys.
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Old 07-31-15, 10:31 PM
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Originally Posted by Carbonfiberboy View Post
^That's a good idea. I happen to have quite a pile of what are probably the right size from pinning numbers on jerseys.
That's what my supply is, too. Always a couple around the bicycle maintenance area (aka man cave). I'd love to find some real stainless steel safety pins- when they rust, they look ugly.
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Old 08-01-15, 01:35 AM
  #5  
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Have used Avid Rim Wrangler holders (these should be what your using with the 7's) with multiple brands of pads/pins over many years, and never had any issues, for what your saying about being able to remove with needle nose pliers, how else are you going to remove them to get the old pad out? The pins need to be in and pushed down so the are embedded in the top of the pad, after that, they should move till you remove them
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Old 08-01-15, 08:26 AM
  #6  
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or use KS molded in 1 piece brake shoes .
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Old 08-01-15, 08:36 AM
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Does anyone bend over the bottom of the pins to lock them in place? With the tandem, I need to be able to use the pads I want, in my case that's SwissStop GHP2 green pads.
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Old 08-01-15, 09:36 AM
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do they use a cotter pin. instead of a set screw and a groove molded in the pad? ..

It Has long been a common mechanic's working method to bend the 2 legs of a Cotter Pin apart, to keep it from coming out.
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Old 08-01-15, 10:10 AM
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Originally Posted by fietsbob View Post
do they use a cotter pin. instead of a set screw and a groove molded in the pad? ..

It Has long been a common mechanic's working method to bend the 2 legs of a Cotter Pin apart, to keep it from coming out.
It's a special pin, not a normal cotter pin. It has a little leg that bends over a bit when the pin is inserted. It's supposed to keep the pin from backing out of the upper hole, but you can easily pull the pin out with a pliers.
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Old 08-01-15, 10:12 AM
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You straighten out the bend in all cotter pins to remove them .
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Old 08-01-15, 11:10 AM
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Originally Posted by fietsbob View Post
You straighten out the bend in all cotter pins to remove them .
You haven't seen them, don't know how they work.
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Old 08-01-15, 11:27 AM
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So? wheel bearings in cars have castle nuts, they are secured from un screwing by a cotter pin ,

you havent worked on your own cars apparently.
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Old 08-01-15, 06:46 PM
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Originally Posted by fietsbob View Post
So? wheel bearings in cars have castle nuts, they are secured from un screwing by a cotter pin ,

you havent worked on your own cars apparently.
You're not describing the pins that hold in V-brake pads. They push in, then snap in place. It's not a normal cotter pin.
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Old 08-02-15, 08:16 AM
  #14  
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Here's my solution: I rotated the pins until I could use a pliers to smush the top part all the way down onto the pad holder. The top of the spring part thus snaps out below the top of the pad holder and should make the pin impossible to remove without serious tools. I always carry a small Leatherman on the bike, so I'll have the means to do so if I need to.

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Old 08-02-15, 08:41 AM
  #15  
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Tektro _TRP , set screw pads .. no problem http://www.koolstop.com/images/CXT.jpg
this any better? http://www.koolstop.com/images/KS-VBH2.jpg

these are Fine http://www.koolstop.com/images/ks-sup2dl_art_lg.jpg

I have a bag of pretty generic pada at the LBS I grab from for the repairs
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Old 08-05-15, 12:59 PM
  #16  
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Originally Posted by fietsbob View Post
Tektro _TRP , set screw pads .. no problem http://www.koolstop.com/images/CXT.jpg
this any better? http://www.koolstop.com/images/KS-VBH2.jpg

these are Fine http://www.koolstop.com/images/ks-sup2dl_art_lg.jpg

I have a bag of pretty generic pada at the LBS I grab from for the repairs
Yes, this jpg: http://www.koolstop.com/images/KS-VBH2.jpg shows the problem pin clearly. Inserted as in the photo, they walk up and out of the pad holder. Hence my fix as shown in #14 . I don't want to use one piece cartridges because of the difficulty in getting V-brakes adjusted perfectly so they don't squeal. I prefer simply replacing the pads.
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Old 08-05-15, 01:06 PM
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The original Rim Wrangler pads were a different size than the Shimano-compatible units. If you're using the Avid holders, Shimano-compatible inserts have a propensity to slip out (even with the little pins).
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