2012 Jeep Wrangler Owner Manual - Page 419

STARTING AND OPERATING 417 CAUTION! If the "Brake Warning Light" remains on with the parking brake released, a brake system malfunction is indicated. Have the brake system serviced by an authorized dealer immediately. WARNING! Significant over or under-inflation of tires, or mixing sizes of tires or wheels on the vehicle can lead to loss of braking effectiveness. The Anti-Lock Brake System conducts a low speed selftest at about 12 mph (20 km/h). If for any reason your ANTI-LOCK BRAKE SYSTEM The Anti-Lock Brake System (ABS) is designed to aid the foot is on the brake when the vehicle reaches 12 mph driver in maintaining vehicle control under adverse (20 km/h), this check will be delayed until 25 mph braking conditions. The system operates with a separate (40 km/h). computer to modulate hydraulic pressure to prevent The Anti-Lock Brake System pump motor runs during wheel lock-up and help avoid skidding on slippery the self-test, and during an ABS stop, to provide the surfaces. regulated hydraulic pressure. The motor pump makes a All vehicle wheels and tires must be the same size and low humming noise during operation; this is normal. type, and tires must be properly inflated to produce accurate signals for the computer. 5