If you will be changing your brake lines, I would recommend bleeding them after you're done. Get some ATE SuperBlue, if this is your first time doing it, get the blue one (get the red one next time!). All you need to do is to try to suck your old brake fluid out with a turkey blaster, put new one in the reservouir, close it, put your car on jack stands, ask a friend to sit in the driver seat, you go put an open-end wrench on the valve, connect a clear tube to it, ask your friend to step on the brakes, open the nipple, ask your friend to pump the brakes until u see fresh blue fluid coming out. then close the nipple, put more fluid into the reservoir, go do the next one. I would do the rear-right, rear-left, front-right, and front-left, in this order.Clyde said:Put 330i brakes on my 323ci along with stainless steel brake lines, my pedal is now too soft. do I need to rebleed the system or put on a 330i master cylinder. If I rebleed has anyone used a vacum system, what special steps should I take, or is the use of a pressure bleeder the only way to bleed the lines.
if you don't mind spend $40 for a pressure bleeder (by MOTIVE, bavauto, turner, everywhere has it), u will be able to do it without any helper. I got one and i think it's worth the price.
let me know if u have more questions!