These callipers like most h/brake types rely on an internal to the piston screw/ratchet device.
Bascally the ratchet moves small increments when the h/brake is applied to move the piston height out to compensate for pad wear.
'cours this only works if the correct cable adjustment is done.
the little lever on the calliper MUST be able to move it's whole travel.
Which just doesn't happen if some monkey has tightened up the h/brake cable.
And from your point of view check your garage as these pistons UNSCREW!
not just pump out on the brake.
I've done any number of these,
Honda's seem prone to this.
Worst ones come off and go in the vice and a combination of working the small quadrent lever and unscrewing the piston anticlock uually removes the piston.
What scraps these is if the small lever will not move it's full travel range.
Piston is usually just gummed up and removing it and the seal and cleaning everything except the "rubber" seal with brake cleaner followed by rebuilding using RED RUBBER GREASE
usually results in a functioning calliper.
Then I manually adjust up the calliper piston by working the small lever back and forward until pads touch disk.
Then refit the cables and adjust free play to 4-6 clicks.
Miss adjustment of the h/brake free play is the major reason for failure of the callipers.
It will give you an MOT this year but overtightening the h/brake free play so the calliper small lever doesen't move back to rest/off position will just mean two new callipers next year.
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