Questions & Answers for: Mini Cooper collapsing

...between the caliper and the master cylinder. Loosen the brake fluid line to the caliper and try collapsing it again. If still no go, start dismantling the caliper and look for bent, broken, stuck ...

Rubbing sound coming from rear right hand side wheel could be anything causing this noise from a collapsed spring to a brake shoe or even a trapped plastic bag so without looking myself i would advise