Need help with my mountain bike brakes!?

Steven

New member
Just got a new mountain bike with disc brakes, first time i've ever had disc brakes so im not familiar with them. it seems that they are loose so when i pull the brake lever nothing happens, but when i tighten the brakes, the discs rub against the calipers when im not pulling the lever and it slows me down. If anyone can help with this it would be very appreciated.
 
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