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ALL 70-81 Camaros came with 11" discs upfront and drums rear. 79-81 Trans am Ws6 cars came with 11" rear discs. Stock brake performance is decent for most cruising applications if using power brakes. The kits below further enhance the stopping ability. A good balance system is critical. See bottom of page for actual real world specs on these systems. Front brake upgrade to 12" kit
Front Big Brake Kit
Rear Disc brake set ups- (not pictured) Call or email for info. Racing Dual Master Cylinder with Balance Bar- a must if not using a booster!
The Tests are in!!!!!! For many years I used the 12" kit with Wilwood stock style calipers, race type pads, and power assist booster. Due to poor "feel" on the track I went to larger rotors and dual piston calipers and converted to manual brakes. The feel was much better but I lost a lot of brake torque at the wheels and the car was very difficult to stop. I have since added the dual master cylinder set up. I was able to use a smaller bore master cylinder front and rear than I could with a traditional "tandum" unit. As a result I was able to increase brake torque by approx 24% at the wheels. I use this calculator as a tool to calculate changes in brake force to see how components affect performance. http://www.jakelatham.com/radical/info/brake_calculators.shtml You'd be suprised how little many of those so called "big brake" kits increase your brake force. Here is how the braking performance of our car has been changed by these kits Stock power brakes cheapo pads 60-0mph 150 feet 12" upgrade, Power, Wilwood single calipers, Hawk HP Plus pads 60-0mph 134 feet (tires were limiting factor, easily locked) 13" with dual calipers, manual dual masters, EBC Yellow pads, 60-0mph 126 feet (brake control very good) For a street driven car, I always recomend Power Boosted brakes. For a car that sees more track than street I would recomend a manual brake set up, power brakes tend to give the brakes a "numb" feel. this can cause you to over brake, resulting in poor cornering and overheated brakes! Brake performance is very important on the street as well as the track, my kits are just suggestions and offer you an idea of what you may be able to obtain. There are many factors which may affect the performace achieved by any of these systems. If you have any questions please call or Email.
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12" rotor upgrade-$450 this set up includes used upgraded spindles, rotors, bearings, Stock Iron calipers (not pictured)and pads, rubber lines, this is a complete spindle unit bolt on package, fits most 15" wheels. Optional Wilwood calipers and braided steel lines add $300 to above kit, red or black calipers add $50. With race pads this system can handle some heavy use
13" rotor kit $1250 includes rotors, dual piston aluminum calipers, modified spindle, hubs, bearings, pads. This is a complete bolt on spindle assembly. No machining required by YOU. Fits most 17" and larger wheels. Drilled or slotted rotors add $50, Red or black calipers add $50. This system is great for track days and is comparable to the Baer GT kit.
Side by side comparison of 12" and 13" kits
Dual master with balance bar $349 this is for manual brakes only and different size master cylinders can be used to optimize front and rear brake pressures. Balance bar replaces proportioning valve and can infinitly adjust brake bias. This is the only way I could get great performance out of a manual brake system (no power booster) Mounts to stock location and uses stock push rod. 
As you can see dual master mounts in stock location, and even uses stock pushrod. Adaptors and extensions are needed to adapt stock lines to the 3/16 lines used on this set up. 
