C5 Brake Experiences?

[ElkySS89]

I'm looking at switching to C5 front brakes and I had some questions. Not so much about fitment but about ways to make them work better.

Those who have them, what is a good rear brake setup that provides a good balance with C5 fronts?

Is there a better master cylinder I should use or is the stock, early GBody one fine?

 

[81cutlass]

I've used LS1 fronts on 2 cars, calipers are almost identical so my experience should apply

I've used 98-05 blazer rear disks on one car and 93-97 LT rear disks on another
I've used a cast iron disk/disk riviera 80 master on my 81 cutlass and a late B body wagon aluminum master on my 86 GP with the lines flipped front to back
Stock disk/drum master has performed badly on both setups with various combos of big disks on the front with or without disks on the rear.

If you have an OEM booster that is pre 82 it probably has a small pilot that won't allow the aluminum body master to seat properly.

Both work great and I have used the stock prop valve with no issues. I can lock up all 4 on my GP (245 front 275 rear 200 treadware tires) from a 30 roll. My cutlass can hold about 3-5psi brake boosting at the track with a turbo buick setup before pushing through the brakes.

 

[ElkySS89]

Is there a performance difference between and early and late Gbody booster?