Hard Brake Pedal...sometimes

[Bugsly17]

if you have aftermarket cams, that will definitly affect your vacuum.

[Bossman]

So after doing some research, I have discovered that it is pretty common for high performance turbo and supercharged cars to not produce enough vacuum to run the power brakes.

So now I am thinking electric vacuum pump. If they come small enough I could put it were the vacuum reservoir is. Any body else here do something like this before and to what result?

I know Nissan 84-88 200sx turbo (s12) has a vacuum pump for this reason, but good luck try finding one of these old girl.

[Marke]

Problem figured out. The car isn't producing vacuum fast enough under performance driving conditions. My tuner said that the Mitsubishi GTO/3000GT had a pretty extensive vacuum reservoir system. He said it was the best thing about that car.(he can't stand them)

So I am going to try and set up an extra reservoir.

[Marke]

Larger extra vacuum reservoir = problem fixed.