brake pads pulverized

Yestarday I was climbing one of my favourites hills, when it began
snowing quite heavily. I had to do the last km with the bike over the
shoulders because there was too much snow on the road to keep pedaling.
Everything fine (if you can call 'fine' snowing in may) until I began
the downhill.
In fact the first km with the road covered of snow is not so steep, so I
stayed on the bike going really slow and carefully, you can imagine I
braked a lot. After a minute or so I noticed the brake pads were
literally pulverizing and also melting (front and rear, same thing),
leaving a lot of black powder/pieces/drops everywhere on the
hubs/spokes/chain etc.
It remained just a little bit of gum, enough to ride home being able to
stop at lights.
I never saw something like that, and I rode several times with snow and
rain, with those same pads. The pads are Dura-Ace 7700 and they have
some 6 months of use (the rims are OpenPro).

....is that normal?

Thanks, Francesco

frenkatfrenk-do-t_ c0m-p said:

Yestarday I was climbing one of my favourites hills, when it began
snowing quite heavily. I had to do the last km with the bike over the
shoulders because there was too much snow on the road to keep pedaling.
Everything fine (if you can call 'fine' snowing in may) until I began
the downhill.
In fact the first km with the road covered of snow is not so steep, so I
stayed on the bike going really slow and carefully, you can imagine I
braked a lot. After a minute or so I noticed the brake pads were
literally pulverizing and also melting (front and rear, same thing),
leaving a lot of black powder/pieces/drops everywhere on the
hubs/spokes/chain etc.
It remained just a little bit of gum, enough to ride home being able to
stop at lights.
I never saw something like that, and I rode several times with snow and
rain, with those same pads. The pads are Dura-Ace 7700 and they have
some 6 months of use (the rims are OpenPro).

...is that normal?

I've gone halfway through a set of 105 brake pads in a wet/gritty 60
mile ride. The same pads had been on for 18 months with no discernible
wear.

Francesco said:

In fact the first km with the road covered of snow is not so steep, so I
stayed on the bike going really slow and carefully, you can imagine I
braked a lot. After a minute or so I noticed the brake pads were
literally pulverizing and also melting

Going slowly down a hill is the worst case for braking, since it
heats the pads the most. The grit picked up from the snowy road was
the finisher.

Quoted message said:

The pads are Dura-Ace 7700 and they have
some 6 months of use

Replace those pads with KoolStop salmon pads. They don't
disintegrate in extreme conditions, and they're kinder to rims:

http://www.koolstop.com/brakes/
--
terry morse Palo Alto, CA http://bike.terrymorse.com/

frenkatfrenk-do-t_ c0m-p said:

Yestarday I was climbing one of my favourites hills, when it began
snowing quite heavily. I had to do the last km with the bike over the
shoulders because there was too much snow on the road to keep pedaling.
Everything fine (if you can call 'fine' snowing in may) until I began
the downhill.
In fact the first km with the road covered of snow is not so steep, so I
stayed on the bike going really slow and carefully, you can imagine I
braked a lot. After a minute or so I noticed the brake pads were
literally pulverizing and also melting (front and rear, same thing),
leaving a lot of black powder/pieces/drops everywhere on the
hubs/spokes/chain etc.
It remained just a little bit of gum, enough to ride home being able to
stop at lights.
I never saw something like that, and I rode several times with snow and
rain, with those same pads. The pads are Dura-Ace 7700 and they have
some 6 months of use (the rims are OpenPro).

...is that normal?

Yep. You're watching the accumulated oxides wash out from
the scratches of your rim and out of the slits in the brake
blocks. At the start of a rain, you'll see grey stripes
down your fork from thet.

--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

Captain's log. On StarDate Sat, 08 May 2004 09:39:41 -0700 received comm from
Terry Morse <[email hidden]> on channel rec.bicycles.tech:

: > The pads are Dura-Ace 7700 and they have
: > some 6 months of use
:
: Replace those pads with KoolStop salmon pads. They don't
: disintegrate in extreme conditions, and they're kinder to rims:
:
: http://www.koolstop.com/brakes/

DI you know if they fit Ultegra (600) brakes as well? Can you fit Koolstop dual
compound pads into them?

Best regards,

martin törnsten

--
http://82.182.73.126/

Quoted message said:

DI you know if they fit Ultegra (600) brakes as well? Can you fit Koolstop

dual

Quoted message said:

compound pads into them?

Yes, they'll fit any of the Ultegra holders that take replaceable pads
(which means anything from the start of the 9-speed group). If you go to
the Koolstop web page at http://www.koolstop.com/brakes/, you won't find any
dual-compound replacement pads for road bikes... yet. It does show an
unusual 3-piece pad that's due to come out sometime in the future but,
frankly, I don't see the need. I ride rain or shine, and have been very
impressed with the Koolstop pad's wear characteristics in the rain (compared
to Shimano).

--Mike-- Chain Reaction Bicycles
http://www.ChainReactionBicycles.com

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

Quoted message said:

Captain's log. On StarDate Sat, 08 May 2004 09:39:41 -0700 received comm

from

Quoted message said:

Terry Morse <[email hidden]> on channel rec.bicycles.tech:

: > The pads are Dura-Ace 7700 and they have
: > some 6 months of use
:
: Replace those pads with KoolStop salmon pads. They don't
: disintegrate in extreme conditions, and they're kinder to rims:
:
: http://www.koolstop.com/brakes/

DI you know if they fit Ultegra (600) brakes as well? Can you fit Koolstop

dual

Quoted message said:

compound pads into them?

Best regards,

martin törnsten

--
http://82.182.73.126/

frenkatfrenk-do-t_ c0m-p <"frenkatfrenk-do-t_ c0m-p"@rse-this-if-you.can> wrote:
[Brake pads disintegrating]

Quoted message said:

I never saw something like that, and I rode several times with snow and
rain, with those same pads. The pads are Dura-Ace 7700 and they have
some 6 months of use (the rims are OpenPro).

Brake pads are Shimano's Achilles Heel - by my reckoning the most useless
product they sell. Replace 'em with Kool Stop Salmons.
--
David Damerell <[email hidden]> flcl?