This is a sign of one of three major brake system failures: severe fluid leak, failed hydraulic component or no brake fluid.
Pulsation or vibration is when the pedal moves up and down at a fast pace while bringing the Cadillac to a stop. This movement means that the brake rotor has excessive run-out and needs to be resurfaced or replaced.
Fading
Brake pedal fade is when the pedal slowly moves closer to the floor board as you hold it. There are three possible causes of this movement: Brake fluid is leaking slightly, the hydraulic system is starting to fail, or the brake pad lining has worn too thin.
No Resistance
Having no resistance in the brake pedal means the pedal quickly goes straight to its lowest point.The brake pedal in your Cadillac is designed to act up and down smoothly. The brake pedal is touchy to any irregularities in the brake system. Abnormal movement is an indicator that a problem exists.
Pulsation or Vibration
