I have a 1991 f350 crew cab 4x4 7.5l truck. Just got the rear drums replaced and a new parking break line put in. I was having problems with the parking break sticking. Parking break works great now but the regular breaks sink to the floor now. When the truck is off I can pump the pedal twice before it gets hard. When the car is on I hear "air" or a "whoosh" coming from the pedal when I press it down. Brake fluid is full. Any ideas.... Thanks
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