I remember those friction adjusters BT, simple and worked well.
The fairly simple adjusters on the Aygo work well too, no trouble at all, but like everything if you neglect them and allow dirt to build up so they are too stiff to operate smoothly then they will fail eventually, due to them being rear brakes normally wear is minimal so the usual thread sticks.
As often said here, by doing things the lazy way and instead of making sure all is returning to fully unadjusted in the drum, so many people just adjust the handbrake cable up and by doing so often stop the adjusters from returning far enough to get another 'bite' at the pawl (ratchet), in time wear takes effect and you run out of cable to adjust.
On all of our cars the parking brake is the drum inside disc design where the parking brake shoes only ever get used when the parking brake is applied, these are almost exclusively manual adjusters, but they too sometimes need to be adjusted up because rust will build up on the drum and the sensible owner gently applies the parking brake whilst the car is moving now and again to keep things clean, usually the adjuster is reached through a hole in the brake drum, and the wheel must be removed on most to access.
I'm not that keen on rear calipers that have built in adjusters where the pads provide both normal brakes and parking brake, not easy to get to the adjusting mechanism to clean service or lubricate, sooner normal drums where shoes do both, unfortunately lazy garages and owners for some reason assume all these systems need no maintenance, not to mention give the cables a bit of lube once in a while.
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