I just replaced my brake line to RB's brake's line and I also reflushed my brake. However I didn't feel any imporvement at all, actually the car doesn't brake unless I step the break all the way down... I feel the break paddle is really soft and almost no break at all... I checked all the fittings and there is no any break fuild leak... I am using Castrol Dot 4 break fluid. I really really don't know why..... can someone help

 

First off, don't drive your car until you fix this problem. Did you bleed the system correctly? You probably have air in your brake system. Make sure you bleed out the air....then everything should be just fine.

 

Was the pedal that soft before you did the brake line swap? If not, you probably have air somewhere in the system.

If it was, check your master cylinder, it could need a rebuild.