brake pedal pushing back

[matthewp]

I have a problem with the brakes that has me stumped, before I installed the new engine I had both boosters rebuilt. The engine has a 292 degree cam, so the vacuum will be lower.When I left the tuner, the brake pedal would push back at you. Now after 5000k's it's not as bad but still not good. Any thought would be welcomed.
Cheers Matthew

 

[hans3]

This is a symptom of inconsistent / inadequate booster action. Your RHD drive booster(s) are different than those of LHD vehicles, I believe. I'm not familiar with the RHD setup, but for a start check the vacuum integrity of the line(s) and check valve supplying the boosters.