[Author Index] [Date Index] [Thread Index]
[Date Prev][Date Next][Thread Prev][Thread Next]

Re: [ST] Near miss Friday - Brake question



Thanks all for your help.  That's 4/4 responses on cleaning the seals - I'm
going to try that first (especially since I have the front wheel off now
anyway after a tire change).

Thanks!

Proverbs 3:5,6

><//>
- ----- Original Message ----- 
From: "Daniel Wallander" <triumph99@xxxxxxxxxxxxx>
To: "ST@xxxxxxxxxxxxxx" <ST@xxxxxxxxxxxxxx>
Sent: Wednesday, November 12, 2003 11:27 PM
Subject: Re: [ST] Near miss Friday - Brake question


> I think the problem with the front brakes is a basic design problem.  Gunk
> builds up around the pistons and doesn't allow them to move properly.
This
> causes two of the pistons to not extend when the brake lever is pulled or
> two of the pistons are not allowed to pull back into the caliper as they
> should when the brake lever is released.  Eventually this leads to mushy
> brakes.  If you remove the calipers and spray brake cleaner and brush the
> gunk off, then 'exercise' the pistons, the feel comes back for awhile.
> What this cleaning cannot do is clean around the seal further inside the
> caliper.
>
> Replacing the seals in the caliper at each major service as the Triumph
> service manual recommends, makes you thoroughly clean the pistons, the
> caliper inside and out and gets new seals around the pistons.  The seals
> help pull the pistons back into the caliper as much as the rotors push the
> pistons back into the calipers.  New seals do this better.
>
> I have about 4000 miles on the seal replacements at this point, not enough
> time to fully know if this did the job or not, but, the brake lever is
> still solid and brake feel is back to what I remember when new, and that
is
> that this Triumph has very fine brakes.
>
> Dan Wallander
> www.danwallander.com
> VP-TSRA, IBA, AMA, ABC, HSTA
> 1974 R90/6    1999 Triumph Sprint ST
> Albuquerque, New Mexico
>
>
> > [Original Message]
> > From: Blake Sobiloff <sobiloff@xxxxxxxxxxxxxx>
> > To: <ST@xxxxxxxxxxxxxx>
> > Date: 11/12/03 7:24:46 PM
> > Subject: Re: [ST] Near miss Friday - Brake question
> >
> > On Wednesday, November 12, 2003, at 06:11  PM, collett_mc wrote:
> > >     My brake question is this - I've got that problem with the Sprint
> > > mushy
> > > front brakes.  You know what I'm talking about - no amount of bleeding
> > > seems
> > > to solve it.  The lever firms up with use but then flabs out if you
> > > don't
> > > use it for awhile (i.e. cruising down the road like we were).
> >
> > I've only found treatments, not cures.  I unbolt the calipers, pump the
> > brake lever to fully extend the pistons, spray the pistons with some
> > carb cleaner and scrub with a toothbrush.  Then I work the pistons in
> > and out of the caliper several times to make sure they glide smoothly.
> > Seems to hold for about 3,000 miles or so.
> >
> > Dan Wallander seems to have had better luck in replacing the seals.
> > Triumph recommends their replacement every 12K miles, IIRC, but I don't
> > know of any dealers that really do that as part of a 12K service.
> >
>
>
>
>
>      *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *
*
>       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 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=