Simple as that in the title, i hope So i have 940 that has soft brakes when car is running but when its not running i can stamp on the pedal with 1000 lamapowers and it wont budge. Also i think this is connected to this, my engine will change rpm more than is normal when pressing pedal and also has leak on intake which obviously makes the car run weird. I tried blowing air thru the valve on side of booster but couldnt blow through. So could my booster be done ? i dont think my master cylinder would do like this, will try to go thru calipers one or two times more but im thinking of busted booster since braking affects my rpm so much.