I've had this quite often with drum-in-disc handbrakes. BMW, Vauxhall, Volvo and Toyota all use the system (to name but a few)
The shoes are held to the backplate in just the same way Dolomite ones are, just a T shaped pin, a coil spring and a slotted cup washer. These are easily dislodged when removing stubborn rusted up old discs, especially if the adjustment is not backed off first (lazy fitters) The result is all sorts of scraping and clicking noises from the wheels. In extreme cases, I have seen the shoe linings ripped off the shoes by such clumsiness!
Kits of new retainers and springs are available for most models from any decent motor factors, fitting them sometimes requires much patience and knuckles that bend both ways!
HTH, Steve
_________________ '73 2 door Toledo with Vauxhall Carlton 2.0 8v engine (The Carledo)
'78 Sprint Auto with Vauxhall Omega 2.2 16v engine (The Dolomega)
'72 Triumph 1500FWD in Slate Grey, Now with RWD and Carledo powertrain!
Maverick Triumph, Servicing, Repairs, Electrical, Recomissioning, MOT prep, Trackerjack brake fitting service.
Apprentice served Triumph Specialist for 50 years. PM for more info or quotes.
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