• 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

  • Can hold the brake on full and still spin the rear wheel with my hand.

    Waaaaaaat

  • Sounds weird. Should be enough bite to stop you from being able to turn the wheel by hand even if you'd soaked the pads in oil. Something else must be wrong. Can you post a pic with light background like Ed suggests?

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

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