Replaced a rear wheel bearing last month. While re-assembling the rear brake drum I had to squeeze the shoes to get it back on. The brakes had expanded a little while sitting. While I was squeezing the shoes they all of the sudden gave way and they collapsed all the way. I could hear a rush of fluid to the front. I assumed I fractured a line somewhere or a joint. No leaks anywhere. The problem is I now have no brakes. The pedal goes straight to the floor. I can pump and build up a small amount of pressure but it fades with in seconds. The brakes were solid on this car before hand. Previous owner did all new lines, and cylinders last spring. Did I ruin my master cylinder? Thanks in advance guys for any input.