Hi.Im the proud owner of a 1978 Cadillac Sedan DeVille and im lovin every bit of it.Until about a week ago i was going about 70 down the highway when my brakes went out in the rear.I checked and i had no fluid so i filled it up. The next day i went to drive to school when again i had no brakes.The worst is that there is no puddle under the car. Please Help