My brakes where mushy after replaceing front pads and rear shoes.

After bleeding the pedal felt good then a few days later it goes to the floor. So I replaced the master cylinder. Problem remains.

I'm not loosing any fliud.

My question is; I understand the ABS module can trap air and may require special prodcedures to properly bleed. But if air is in the module would it not always cause a mushy pedal. In otherwords, being able to bleed the brakes and get a firm pedal mean you have bled all the air and a returning mushy pedal mean more air entered the system. In other other words ABS is part of the "system"

thanks

 

did you bench bleed the master BEFORE you installed it?
Also reman or new master cylinder?
There have been lots of problem with the remans out of the box.