Hey Matt,
Sorry to hear about your braking trouble! The rear Master Cylinder is dangerously close to the exhaust manifold for the rear cylinder. If you fill the Master Cylinder to the top, the heat from the engine expands the brake fluid. With the Master Cylinder full, there is no place for the expanded fluid to go except to compress the brake pads. And since the left front and the rear brake caliper BOTH work off of the rear Master Cylinder, it locked up both calipers! Pull the plug off of the Rear Master Cylinder, Insert your index finger to the SECOND NUCKLE, if there is brake fluid on the end of your finger, the Master Cylinder is OVERFILLED!! Lower the level until it just touches the tip of your index finger with the inside of your second nuckle is touching the Master Cylinder. If this Master Cylinder is UNDERFILLED, you will get a light on the dash to inform you. Splash a little fluid in there, BUT do not overfill the Master.
Because of what happened, you may have overheated the brake pads. The issue with this is the friction medium is GLUED to the metal backing plate. Sometimes the heat is too great for the glue, and the friction medium detaches from the backing plates.
I am a Vendor for EBC braking products, (brake pads, rotors, etc.) And as Richard kindly mentioned, (Thanks for the Props Rich!) I do offer a delink kit which connects BOTH front calipers to the right front brake lever, and connects ONLY the rear caliper to the foot pedal. If I can help you with either of the items, please feel free to contact me.
If the pads didn't separate, lower the fluid in the Master, and go for a ride!
Good luck with this project Matt,
Earl.