Hidro Booster Caravan

Greetings to the whole community of this forum, my question is the following I have a Mod 93 caravan is Canadian this truck brings the hydrobooster brake system but I have a fault since they lit the brake code and also the ABS the problem is that when I turn on the truck the brake pedal gets hard and does not face until it passes more than a minute when lighting it is heard as an electric motor But if I need to give an emergency braking not for the pedal hits to the bottom and get hard they told me that I can adapt the boster and conventional pump of an American this is possible they have some manual of this type of brake system (Hidrobooster) I await their answers and greasias

In a vehicle everything can be done, if you can adapt but there are no manuals to adapt that is essay and error nothing more, when the pedals are hard it is generally because there is empty leak from multiple to the servo, Czech first wants to do not so much the problem is not so much.