Weird pedal feel, low vacuum??

[TheChief]

Hey guys,

I have a set on wilwood 6 pistons up front and 4 on the rear, all running on the 12.2 in drilled and slotted rotors. The master cylinder in a Detroit speed master/booster.

So far been very underwhelmed, the pedal feel is very off. On long straights where there is little need for braking, when I come to brake the pedal is soft and the brakes are snappy, under heavy braking in twisty roads the pedal is very hard and brakes are soft and unresponsive.

Could this be low vacuum/vacuum leakage? or does it just need a good bleed, or both...

It's powered by a 383.

Any help would be much appreciated as I don't feel entirely safe driving it

Cheers

Jonny