Full guide for YOUR Citroen C1 rear brake shoe replacement. 107 and Aygo are the same. Ours were only half worn, but the handbrake levers were seized.
🎥 C1 / 107 / Aygo front discs & pads:    • Citroen C1 Front Brake Discs and Pads...  

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With such a lightweight car, the rear shoes would normally be expected to last a long time. These had done 85k miles and were a little less than half worn. On this basis, you might expect shoes to last 160-200,000 miles but as can be seen, issues other than simple friction material wear can cause replacement.
Unlike disc brakes, the dust in drum brakes is trapped inside the drum. There was a lot of dust and on this basis I would suggest that the drums are removed for a clean at least once a decade or every 75-100,000 miles.

🛠 Some gear you might be needing
Got a fluid leak❓ Here is a Febi Bilstein kit with shoes, cylinders and fitting kit:
UK: https://amzn.to/3BeOZ4J
Shoes only, Borg & Beck:
UK: https://amzn.to/3evmfuK
Don't forget brake fluid if you're changing cylinders or yours is more than 2 years old
UK: https://amzn.to/2Ujyzrk
BIG 600ml spray can of brake cleaner. This is what I use
UK: https://amzn.to/2UgGaqB
MINTEX Ceratec (same as I use)
UK: https://amzn.to/2Un5Ph6
Or maybe you like Liqui Moly products (I do, they are generally very good)
UK: https://amzn.to/3xRMjI6

Learn more about looking after your car:
🎥 How to replace a CV [constant velocity] joint boot with a split kit:    • Universal CV Boot Repair Kit | CV Gai...  
🎥 Don’t let your fuel filter end up like this 100,000 mile old example:
   • Why Should I Change My Fuel Filter | ...  
🎥 Battery & alternator care in this playlist:    • Alternator and battery care  

Everyone should have a tyre pressure gauge in their glovebox:
http://bit.ly/Tyre_press_guage
http://bit.ly/Pressure_Gauge_2
I personally prefer a stirrup pump to a foot pump (I use the same one for my bikes and cars)
http://bit.ly/Tyre_stirrup_pump
If you’d like to learn about the science and engineering of cars:
Bosch Automotive Handbook:
https://amzn.to/39va9xA

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