2009 Dodge Ram 2500 Pickup Owner Manual - Page 333

STARTING AND OPERATING 331 If either the front or rear hydraulic system loses normal braking capability, the remaining system will still function with some loss of overall braking effectiveness. This will be evident by increased pedal travel during application, greater pedal force required to slow or stop, and activation of the "Brake Warning Light" and the "ABS Warning Light" (If Equipped) during brake use. 3500 Dual Rear Wheel Models Only The brake system power assist is provided by a hydroboost unit which shares fluid with the power steering system. You may experience some clicking or hissing noises from the hydro-boost system during hard braking conditions. NOTE: Under cold temperatures, pedal effort will be higher than normal until the power steering fluid reaches operating temperature. Four-Wheel Anti-Lock Brake System WARNING! The Four-Wheel Anti-Lock Brake System contains sophisticated electronic equipment. It may be susceptible to interference caused by improperly installed or high output radio transmitting equipment. This interference can cause possible loss of anti-lock braking capability. Installation of such equipment should be performed by qualified professionals. The Four-Wheel Anti-lock Brake System (ABS) is designed to aid the driver in maintaining vehicle control under adverse braking conditions. The system operates with a separate computer to modulate hydraulic pressure to prevent wheel lockup and help avoid skidding on slippery surfaces. 5