Brake pulsation usually only has one cause, warped rotors. The main cause of warped rotors is excessive hard braking or fast stops, which can severely overheat the discs causing warpage. Replacing your front brake pads and rotors with new high-performance products is the best way to guarantee your safety as you head out on the trail!
Disclaimer: If you’re not comfortable working on your brake system, please seek a professional mechanic, because of safety issues. Otherwise, watch this video for entertainment or education purposes only.