Z32 brakes WONT BLEED

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Installed front calipers, rotors, and SS lines on the front.Used clear tubing on bleeder to see any air, bled till no air comes out.Pumping the brakes quick, the pedal gets stiff.But once you let off the pedal for a second and press down again, pedal goes all the way to the floor and no pressure until you pump them quick.

While looking at the fluid leven in the master cylinder:Pumping quick till brakes get stiff - fluid level goes downThen let off the brakes - fluid rushes back up into the master cylinder

I thought the master may be bad, replaced that... no change.thought the lines may be letting air in somehow, replaced them, no change...Tried bleeding rears and fronts also in the right order... nothing.

No brake fluid leaking from caliper, bleeder screw, or lines.Brakes hold pressure after you pump them quickly, and holds the pressureuntil you let off.

I have no idea whats going on but its really pissing me off...Any idea what could be causing this??

Here are the Specsz32 frontsstock rears5spd s13 master cylinderauto s13 brake booster

[got chub]

you have the bleeder screws at the top? air goes up... it lighter than the fluid. where did the brakes come from and what is the condition of the seals? you might need to rebuild them. its very easy and doesn't cost that much. also i recommend you get a z32 MC for better pedal feel

[r3v_v3ng3]

most likely you didn't put the bleeder valve on top.

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Calipers are already rebuilt, new lines, and new master...bleeder on top... going to try and reverse force bleed them today. That should do the trick.

Now I have an extra pair of brand new Z32 conversion lines if anyone wants to buy them.I'll post them in the for sale section soon.

[got chub]

you do know to bleed all the brakes not just the front. start from the one furthest from the MC

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I reverse bled the system, everything is perfect! night tight pedal and brakes feel much better than stock.

The rears weren't changed... there is no air in those lines, and no reason to bleed them.atleast until I change the rears today.