[krugracing12]

The system you are asking about has dual caliper plates (i believe S and W race cars sells them) with 2 separate master cylinders and 4 wheel cylinders. one system operated by foot and one by hand. Short of losing the actual mounting plate or rotor on the rear end, any individual part failure on one system - M/C rod or brake line or W/C piston, etc you will still have a complete system to stop the vehicle