• Thanks folks. I'm fairly certain it isn't cable tension, both front and back have similar tension - front brakes ok, rear doesn't.
    Still feels as though there's some containment in there. Can hold the brake on full and still spin the rear wheel with my hand.

    Pads are generic branded Giant ones, will try something better. Also tempted to buy a new rotor just to rule that out as well

  • Take it to a reputable bike shop and ask them to inspect it, best option

    Is probably what'll end up doing. I'll wind the pistons in as far as they go and see if I can still the spin the wheel to rule out any cable issues first

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