2009 Dodge Ram 1500 Pickup Owner Manual - Page 350

348 STARTING AND OPERATING 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 system's pump motor runs during an ABS stop to provide regulated hydraulic pressure. The pump motor makes a low humming noise during operation. This is normal. The ABS conducts a low-speed selftest at about 10 mph (16 km/h). If you have your foot lightly on the brake while this test is occurring, you may feel slight pedal movement. The movement can be more apparent on ice and snow. This is normal. When you are in a severe braking condition involving use of the ABS, you will experience some pedal drop as The Four-Wheel Anti-Lock Brake System (ABS) is dethe vehicle comes to a complete stop. This is the result of signed to aid the driver in maintaining vehicle control the system reverting to the base brake system and is under adverse braking conditions. The system operates normal. with a separate computer to modulate hydraulic pressure to prevent wheel lockup and help avoid skidding on Engagement of the ABS may be accompanied by a pulsing sensation. You may also hear a clicking noise. slippery surfaces. These occurrences are normal, and indicate that the system is functioning.