Got my replacement rear caliper through and tried to bleed the brakes but the pedel just wont go hard. I've got no leaks and bled them in the right order so I am wondering if its the master cylinder? Do they havea habbit of going if not used for a while? As my car was stored for 10 years.

 

same thing happened to mine was a year before i bleed the brakes and pedal just went to the floor and it did turn out to be the master cylinder