power brake assist

My '99 Taurus just lost the power brake assist. I have to press the brakes very hard to stop. The driveability of the car also seems to be affected. I suspect a problem with the vacuum hose going to the brake booster. Is this hard to get to for inspection and replacement?
Thanks

The hose is easily gotten to. While you are there, check the valve it hooks to in the booster. It is a one way valve and you should be able to blow through it on one side and not the other. Look at the grommet that holds it into the booster also.