RE: [ST] For Brakes as Hard as Abs

["Alex Ozzard-Low" <alexol@xxxxxxxxxxxxx>]

Don't know whether this is correct or not, but my understanding is that...

When you apply pressure to the system, any air bubbles become dramatically
smaller, often decreasing in volume to a small percentage of their original
size at atmospheric pressure.  Smaller bubbles have less contact area with
the inner walls of the brake lines, which means less adhesive capability,
therefore have a greater tendency to migrate upwards - effectively, this is
a form of bleeding the system.  The harder you apply the brake overnight,
the better it seems to work (smaller bubbles).  Of course, you are not
actually getting rid of all the air as sometimes the localized highpoint is
not the upper part of the system, and the bubbles get trapped in places like
the calipers and T-junctions.

It's not a substitute for proper bleeding, but it helps.

Alex





From: owner-st@xxxxxxxxxx [mailto:owner-st@xxxxxxxxxx]On Behalf Of Rich
Hartwick
Sent: 07 April, 2002 11:00 AM
To: ST@xxxxxxxxxxxxxx; William Sanders
Subject: [ST] For Brakes as Hard as Abs


>

Bill,

Try this trick that my dealer's mechanic showed me.  Tie the front brake
lever back with a nylon tie to similar thing.   Put moderate pressure on the
lever.  Leave it on overnight, then cut it off in the morning.  You should
find the brake travel is minimal, and they will feel hard rather than mushy.

I am not sure why this trick works, but it does.  My guess is the seal on
the caliper pistons does not advance in the piston bores as freely as it
should - this long term pressure forces the edge of the seal to advance,
thus pulling the pistons into close contact with the pads/rotors, and
minimizing free play.  Try it anyway, and let us know how it goes.

Rick Hartwick
900 Trophy, and no more shoulder pains

PS

I am forwarding this to the Trophy group as well, since there have been
several posts on this same problem there.

>
> Date: Sat, 6 Apr 2002 14:58:38 -0500
> From: "William Sanders" <tuckersdad@xxxxxxxxx>
> Subject: [ST] Brake Lines
> ....
>   The brakes on my ST work well, but there is a fair amount of lever
travel,
> and the lever feels a bit mushy. They've never been serviced for any
reason,
> and have been like this since day one. I just assumed the difference was
the
> lines, but now I'm not sure.The brakes on the MZ are two pot, single rotor
> Grimeca's, so the advantage here would seem to go to the ST. I'm not due
for
> dealer servicing until the fall, and they're a hundred miles at that, so
I'd
> prefer to resolve this at home if possible. Maybe there is nothing wrong
> with my ST's brakes, and I'm just spoiled with the MZ brakes. Does my
> description of the feel of my ST's brakes seem familiar to your
experiences?
>
> Thanks again for any responses, Bill
>
>  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . .
>
>                       End of Triumph ST/RS Digest
>             ST/RS Digest is sponsored by Jack Lilley Ltd.
>           http://www.TriumphNet.com/st/lilley for more info
>    http://www.TriumphNet.com/st for ST, RS and Mailing List info
>
>           This digest Copyright 1999-2002 TriumphNet.com


     *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *
*
      The ST/RS Mailing list is sponsored by Jack Lilley Ltd.
          http://www.TriumphNet.com/st/lilley for more info
   http://www.TriumphNet.com/st for ST, RS and Mailing List info


     *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *
      The ST/RS Mailing list is sponsored by Jack Lilley Ltd.
          http://www.TriumphNet.com/st/lilley for more info
   http://www.TriumphNet.com/st for ST, RS and Mailing List info

=-=-=-= Next Message =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=