Urgent!! please help me..

[mrcrazybutt]

So i did the z32 front brake swap w/ z32 master cylinder. The bleeders on the calipers are on the top. I bleed the brake from rear calipers to front calipers. Then i bled the ABS front one then rear. I have pressure. BUT... the pressure dissapear the moment i start driving! i have to "repump" the brake pedal to get just enough pressure to stop. And when i do stop... my wheels feels like it was gunna fall off because it was so shaky ! The master cylinder is brand new. I dont think that can be the problem... does anyone have any ideas?? I searched. And that is why i bled and bled and bled and same thing happened. I also bought new master cylinder because i thought it was the problem.. i really dont know any more solutions... can someone help ?? =[

[NissanPartsDepartment]

sounds like your rotors are either very badly warped or not seated properly.

[compactfean]

If you loose your pedal AFTER you start it you have a brake booster issue.

[sr2092]

Need a new brake booster. once the car starts you cut on you vaccum system and thats where the problem is.

[Biggins240sx]

did you bleed the air out of the master cylinder before installing it? Could be a brake booster issue, but you should beeld a mastercylinder before installing it so you won't introduce air into the system.