Monza front brakes
Converting to Monza ventilated rotors, calipers and brake pads is a worthwhile upgrade on the early Vega. In addition to the ventilated rotors, you get larger pistons in the calipers (for more braking force) and more surface area on the pads. This conversion was done using the Vega spindles, and mud/dust shields.
The rotors were converted to 5 lug by Moser Engineering. They use 1/2″ screw in studs.
This is very close to a bolt-in conversion. The wheel bearings, and grease seals are the same between the Vega and the Monza.
Minor grinding (more like polishing in my case) was required on the Vega spindles to clear the rotors, and the mud/dust shields needed massaging with a hammer to clear everything.
The Monza calipers I am using have a metric banjo bolt. The metric banjo bolt is shorter than the U.S. thread bolt, so you must change the flex hoses to a metric application. I used hoses for a 78 monza.
I also converted to a larger master cylinder & power brakes.
A 78 monza master cylinder would give you the additional fluid volume you would need.