Chevrolet Repair: 93 LUMINA BREAKS, wheel disc, master cylinder

Question
i have replaced the rotors, calipers, pads,lines,bleed the breaks but still no breaks once the pedal is released it loses all its breaks you pump it a few times and hold it down it has breaks let the pedal return up and you lose all breaks  

Answer
Hi Bob,

When you press the brake pedal once and the brakes are low, or not there; then release the pedal and press again, and the brakes are good; this is tell tale master cylinder.  

You need a master cylinder.  MAKE SURE BEFORE YOU PUT THIS ON THE CAR, YOU BENCH BLEED IT!!!  More times I hear how the new master cylinder is spongy.  Most people don't bench bleed it.  It is so simple to do.  

Your car should have 4 wheel disc.  You need to bleed the brakes in this order.  Passenger rear, then Driver front.  Then driver rear, and lastly passanger front.  You kriss-kross on all wheel disc.

Good luck

C J S