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Do you still find any wet spots on the braking system after riding? If it introduces air while simply bleeding, and it is indeed a leak, it shouldn't be too hard to locate said leak.
Otherwise, the fading out while riding can also be caused by the rear brake adjustment. This is a common issue with new bikes. If there is no free play in the pedal then it will put a tiny bit of pressure on the brakes. As you ride the brakes will rub and slowly heat up, eventually leading to brake fade.
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