this is wierd.
It worked completely as expected on my wagon with completely standard system. Factory drums all round, then ran kb110 brakes/struts and didnt change anything, then the s13 brakes onto kb110 struts with s13 flexi hoses/rotors/calipers. Bled the brakes, worked perfectly. Has twin reservoirs from factory etc.

would be interesting to know what the actual problem is...

its common for old master cyclinders to retire when bleeding brakes. Especially if you have depressed the brake pedal all the way down past the point that the brakes normally operate.

you should only use short strokes of the brake pedal to build up the pressure

i found out the hard way!

I'd say check that the bleed nipples are at the top. You'll never get the air out if they're not.

thanks guys... yes my bleed nipple is on top... hhmmm i think my mastercylinder is the problem. i'll try to change it this weekend. hope will solve the prob. cant wait to try the S13 brake setup..

un bolt your master but not all the way,then try and bleed?. sounds like your master is not returning all the way.just leave it loose and try. is the fluid going down when u push the pedel?
TOMMO

if it didnt have enough free play the pedal would pump up till it was rock hard and stay that way, as it wouldnt be releasing the pressure

have you bled the master cylinder first?
sometimes you need to bleed it first to make sure its actually pumping fluid

or just pull the brake lines off the master cylinder and then pump the brakes, obviously have something to catch the fluid, that way you will be able to figure out if the master cylinder is the problem

the thing that got me with mine was when i changed the system back it was fine again

yours is a disk front to start with right? there's that lil' spring loaded valve you're supposed to partially dismantle when switching to disks, could that be it?

thanks guys...

check valve shouldnt cause it, ive ran my car with 4 wheel discs on a disc/drum master for ages without a drama