worked before and had perfect bias

Then you don't need to replace the master cylinder.

Try bleeding the M/C again. Make sure to bleed both half of the M/C, as air in either side can affect front or rear.

Generally, you bleed in this order:
Passenger rear
Driver rear
Passenger front
Driver front

Highest point to lowest point. And as the boys say, bleed calipers with bleed nipple to the top. Sometimes you have to swap calipers side-to-side or front-to-back, so you have to bleed them with the calipers detached from the backing plates, but pushed onto the disc, so that you can keep the bleed nipple pointing up.

No Lobster..this isn't time to paste a "nipple" into the thread..

Chris

its the same brakes that worked before,

bluebird disc over drums on the rear and hi-lux four spots on front

i've bled four times, only other thing is bleed nipple on master, i bled this once, after just bleeding calipers didnt work, but dont know what order it was supposed to be done in or anything???

7/8 master is fine Mike.
Sounds like air or other such prob.........what brakes are they that your fitting ?

i have the 180b master, and dont know if that thingy was taken out but it worked before and had perfect bias

Is the 200SX the equivalent of the 810 (the Australian 200B)?

They never came with 4wheel discs..not that I know of.

I think it's the S12 Silvia (Gazelle) we are talking about in relation to the 80-84 200SX.

Chris

yeah, thanks for the help,

one thing i didn't say was this setup was working before i put the new lines in, and it had perfect bias (a little more on the back)

i have a 180b master in it now, have to change it i guess..

try using a 200sx 1980-84 master swap in your pushrod and the bias will be right for disks on the back. the stock m/c is biased for drums and will not provide enoug fluid to operate the rear disks correctly. I have done the swap severall times on 510(1600)s and ran into the same problem, once I figured out the fix I had no problems out breaking corvettes and supras (I was going 40-50mph slower admittedly)

hi another thing to check,make sure the bleed nipples are at the top side of the caliper,you may just have them on the wrong sides.air is lighter than brake fluid and will sit at the top of the caliper,giving u a bad pedal.just a thought.

180B I think. It was my old one procurred 10 years ago, so I'm not sure. Sorry.