Brakes won’t ‘hold’

I guess I haven’t looked at it this way. I assumed the front brakes did most of the holding/stopping vs the rear. But I could be wrong there for sure.

What you describe is how I’ve been launching the car at the line. Hold the brake. After staged bring rpms up enough to load the rear end and then stab the gas on the last yellow. Leaves pretty decent but I don’t know if it would burnout like this. Just took off. I was only running 12psi in the rears tho ha