I went downtown the other day and after I went into the parts store and came out and tried to back up my front bracks felt real tight, and the pedal was all the way at the top. This is on a 84 Hot air car so it is not a power master. What could have happened? Possibly the master cylinder went out, or the brake calipers hung up or what can you guys help me out here? And what is the best way to check either! Thanks in advance Tony