I've inherited my father's 1941 plymouth. One of the problems I have is with the brake system. We put new master and wheel cylinders on the vehicle and my dad used a silicon based brake fluid. We"ve had trouble since then with the brakes not building enough pressure to work very well. Someone talk me that the o rings in the system are made to use with regular brake fluid and that's why the brakes don't work right. My questions are, is this information correct and how is the best way to get the old fluid out of the system. I not going to drive it until I get this problem taken care of. Thanks for any help.