My brakes are leaking can't fine the leak, help. on 1998 Chevrolet 1500 Pickup

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front break reservior is empty after a week. cannot see any fluid on ground.
(3) Answers
Have a 'mechanic' check the brakes and perform necessary repair!!!
unbolt the master cyl. to check for leak into the booster
it could be leaking into the power booster it was on my 98 1500 replaced the power booster and all was good