High-Caliper 4-Wheel-Disc Brakes for The Last Mustang. Originally published in the July 1990 issue of Hot Rod magazine. ... The new proportioning valve is self-grounding and requires only two wires.

Factory four-wheel disc brakes complement our handling modifications for Firebirds and Camaros. As promised last month, we've installed the new '79 four-wheel disc brake package on our '77 Trans Am.