I own a 2002 Nissan Altima when I first go to start the car on very cold mornings I start the engine and put my foot on the brake pedal put it into gear and the pedal is higher than normal and have to apply allot of pressure to stop the car from rolling out of the driveway, after about 30secs. the booster kicks in and the pedal and braking return to normal for the rest of the day, anyone have any ideas?