octaneman

Hi natur3

After reading your posts, my question to you is : Was the new master cylinder bled first ? Do you have ABS brakes? If equipped with ABS on some systems the engine has to be running to build pressure, there is sequence to follow when bleeding the system. If the sequence is not observed, no matter how many times you bleed it , there will be air in the system. The rule of thumb is when bleeding the brake system is you start from the farthest wheel to the nearest. ( Right Rear, Left Rear, Right Front, Left Front.) But it is not always the case, some need to be bled in a cross pattern ( check your type of system on Chilton's or Mitchell On Demand). In some cases ( mostly in the rear) there is a diverter valve that works in tandem with the rear suspension and the proportioning valve, this has to be positioned correctly for the air to be bled properly.