I have had my ST4S for many years now and have NEVER truly sorted the shuddering front disc issue.
It has often improved with things I've done...sometimes its disappeared for a few weeks, but it has always come back.
I replaced steering head bearings with tapered rollers with care and diligence making sure the seating was perfect.
I've regularly cleaned and spun the disc buttons with brake cleaner and an easyout on a battery drill.
Removed and checked discs for runout.
Did the multi times heavy braking and release procedure.
Scrubbed disc surfaces clean of pad residues.
Eased button tabs to create full floating discs.
Ensured I never held front brake on after hard stops that might leave pad residues on disc.
I have to admit I haven't replaced the pads as its never made sense to me how the pads alone could cause these symptoms...whats the physics behind a pad material grabbing and not grabbing as a disc spins underneath it?
And I haven't replaced the banjo bolt.....And I'm thinking I could/will/might do that next.
With persistent issues like this there's an enormous amount of owners advice that suggests solutions that just don't seem to stand up to scrutiny.
ST brake shudder is a huge topic and I've read most threads including those that seemed very plausible.
The local bike shop advises replacement discs and pads...which is exactly how a local bike shop can be expected to behave.....but if there's nothing wrong with either of the discs or pads ...why should I do that??
It would be good to hear a bit more science than hearsay.
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