hello, i have a problem on my 2001 3500 duramax. in the mornings i have very little brakes, i have to push hard on the pedal to get it to stop. when it starts warming up the brakes get a little better. i installed new brakes pads front and rear this past weekend but it got no better. i still have good power steering, the pedal does not creep to the floor like a master cylinder bad. has anybody had the same problem ?