I have a 2004 Chevy Silverado 2wd ext cab.I just lowered it with 2in spindles.Now when I make a sharpe turn or u-turn the brake pedal gose to the floor.I pump it 2 or three times it comes back,and when backing up while turn the pedal builds presure and gets hard.Any suggestions what I should be looking at.

 

            Thanks

It's probly not related to your modifications. My guess is your master cylinder is failing, your brake calipers are failing, your wheel cylinders are failing or your brake pads are almost worn out.

Did you figure out your problem?