I'm having problems with my pedal box it runs 3 reservoirs, front, back and clutch. I've adjusted up rear shoes (new cylinders also shoes).
I have Hi spec 4 pot calipers with 2 piece brake discs.
Non servo. Bias valve.

I don't know much about pedal boxes but when I'm putting my foot down at high speeds I feel like there's not enough to stop me.

Brake pads maybe for track spec? Not sure.

I've tried new fluid and bleeding them out.

Could it be down to settings at pedals?.

Starting to get frustrating........

 

Have you driven with a pedal box before?

If not then that may be all it is! They take a lot of getting used to having no servo assistance makes the pedal very hard and if you want to stop then you have gotta mean it lol

 

if it is specced correctly then the pedal pressure and feel is so much better than a servo system.

I have never had to stamp hard on any of my pedal boxes to make the car stand on its knees.