I recently replaced the stock rear drum brakes in my 88 sr5 to the 89 gts rear discs and shocks. I had to replace the brake booster and master cylinder as well just to make sure that the there wasn't a difference between the two different master cylinder's. I bled the lines very well, but my pedal still feels a little spongy. It's not real bad, but it is more spongy then it used to be. I also noticed that the discs in the front are a little bigger than the discs in the rear, so the ones in the front getter hotter than the ones in the rear do. My question is does anyone know why I could be experiencing the spongy problem. Maybe someone else has done a similar modification and could let me know what they encountered.