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Went through the same hassle and did allot of head scratching.

I had the 4 piston calipers on the fronts and they held in the burnout box easy. Then I changed to the single piston calipers for the spindle mount wheels and it would push forward on the burnout.

I have to make sure I pump the brakes and trap at least 1000 psi on the line lock and it will hold .
I have a 3/4 master cylinder on the front and a 7/8 master cylinder on the back running dual 4 piston calipers




How does it do on stopping power at the top end? Are you running two separate master cylinders?

I ran it like this when i had a 750hp motor and it was no big deal. Now i have a 1100hp motor and plan to run nitrous also so it becomes a whole different story. I chose to not go test with it when i had the chance a month or so ago because i was scared of these front brakes! I just want to make sure everything is right before i go to the track with it. I guess i need to get a pressure gauge and see what ive got there.