S13 Brake Problem

[Zushi]

I just got done putting 300zx calipers and rotors on my 240sx. I have the 300zx master cylinder too. My brakes are soft though. While my car is running, the pedal has to be pushed down 2 times before it will grip on the 3rd press. I've bled the system about 3 times fully, and it is still soft. When i push in the brake pedal (until it gets tight), it loses its tightness in like 10 seconds. I am still using the stock S13 brake lines, I've heard that I had to upgrade the brake lines to match 300zx....is this correct? I would really like to get a hold of anyone who has done this brake upgrade...if anyone has any suggestions..let me know. thanks.

[navysnail]

there is a leak somewere. i sugest locating it and fixing it asap. look around the mc

[D1SR240]

my friend's rear caliper (92 240) was leaking, and his brakes felt soft as hell.

~swave

[Hijacker]

i take it you're using the stacked washer method of attaching the stock S13 lines to the Z32 calipers. Swap to a conversion line, and that should hopefully cure your problems.

[Zushi]

Hey, what lines, are you talking about the rubber lines or hard lines? I have brand new rubber lines, but the stock s13 hard lines(some of them, i replaced alot of them). are the 300zx brakes ran off of a larger hard line? I have no leaks though. I can pump it all day but I dont see any leaks....is it possible that I could have a leak where air goes in and ****s up the system but fluid can't leave? thanks.