I installed a new 9" brake booster today I bought from Hubbards,
i believe the original was not holding vacuum,
I bolted to the existing single master cylinder as it looked new.
problem is , now i have a stiff pedal, like they are manual brakes,
the car stops but you have to stomp hard on it,
i checked the vacuum line from the manifold and it has suction,
i checked the drums and brakes and they look good,
could it be the brake booster pin? are there different lengths,