Proportioning valve: 82-92F - 4 wheel discDistributes brake fluid to the 4 calipers. As there is different proportioning valves for different years, the 82 92 Firebird TA & Camaro series is disc disc or disc Drum.. , be sure to leave your vehicles year model details in the Check Out section as you finalize the order. All proportioning valves are Brand New. Delivery is included when ordered and paid online for supply within Australia. GET A PVTOOL if you don't have one. Use of this tool