My race car is a 89 mustang coupe with all wheel disc brake conversion... All new brake lines new calapers etc. The brakes dont work unless I pump them a few times first? The system has been bled correctly but still the same.? it has a manuel brake conversion on it aswell.. all air is out of all four corners. the brake pedal is real soft feeling.Any ideas? Maybe manuel brakes dont push enough foru calapers? Anyone run front brakes only on there race car?