I'm sure this question has been asked a thousand times and answered just as many but maybe someone can answer again... I have a 74 'Cuda, front power dicks stock. I converted to disks in the rear with a SSBC kit. The breaks work fine, no fade during stops. However, the breaks stay on a enough after i let off the peddle that if I am on a slight hill and put the car in neutral, I dont roll and the lights will stay on. It seems to happen when I apply the breaks slowly or just a little bit but if I quickly tap and release, the peddle comes back. I have a rebuilt master cylinder and new lines and calipers and everything. I bought a brand new master cylinder today in hopes that the rebuilt one is just a dud but I was also told something about the proportioning valve. Does anyone know what my problem is? what should I do?