Over the past few weeks I noticed that the brake pedal was low on my 1974 Super Beetle so I removed all 4 drums and inspected the shoes. Turns out that the shoe linings on the right rear drum were worn almost to the metal. I installed new Raybestos shoes all around and while one wheel cylinder was shoeless I pushed the brake pedal down. With new shoes I drove the car a few blocks and found that the brakes were barely working and the pedal was all the way to the floor. I had to ask for help in bleeding the brakes and now the pedal is high again. Did I introduce air into the system when I pushed down on the pedal with no shoes connected to a wheel cylinder or was air introduced as the shoes were worn down? Did I damage the master cylinder or the wheel cylinder?
Thanks in advance