Mini caliper rebuild – Part 1

Austin-Rover Mini City E

Mini gets a brake overhaul. Citroen BX rear seat should be back in the car, rather than being a Mini hat...

It was going so well. Despite a hectic week with much writing work, I actually managed to find some time to work on the Mini’s brakes. They’d started binding really badly and before Christmas, I had the pads out and discovered seriously manky pistons (see below). Rebuild time.

Rimmer Brothers were able to supply the bits I needed and after finally getting my hands on the necessary tools (Ebay saved me a fortune) I could begin work. Being a bloke, I decided to find my own way, rather than lower myself to reading instructions. This was how I ended up removing the caliper BEFORE undoing the main driveshaft nut. That made removing the brake disc (I decided to replace everything) impossible. Fortunately, I managed to put the wheel back on, jam a ramp underneath and then undo the driveshaft nut without having to go through the rigmarole of lowering the car of its axle stands.

When putting the wheel on, I noticed that I’d managed to damage one of the wheel stud threads, so work has come to a stop while I await a new one. I did get as far as fitting new pistons and seals to the caliper on that side though, so progress has been made! Once I get the new stud, I can put it all back together again and do the other side…

Corroded Mini brake piston

No wonder the brakes were binding - and this is the better side!

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