Master cylinder or booster
 

I have a 92 Chevy Beretta and am having brake problems. At first I thought it was the brake line but after looking things over, I now feel it is either the master cylinder or booster. Is there a way to tell which of these could be the problem and how involved it is to fix.

Thanks :confused:

what kind of pedall do you have? does it go to the floor when the engine is idling? how about when the engine is off? do you have a firmer pedal then?

will the pedal hold at the same spot, when you are stopping at a light? or does it slowly want to move towards the floor?