Anti-Lock Brake System
The 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 lock-up and help avoid skidding on slippery surfaces.
All vehicle wheels and tires must be the same size and type, and tires must be properly inflated to produce accurate signals for the computer.
The Anti-Lock Brake System conducts a low speed selftest at about 20 km/h. If for any reason your foot is on the brake when the vehicle reaches 20 km/h, this check will be delayed until 40 km/h.
The Anti-Lock Brake System pump motor runs during the self-test, and during an ABS stop, to provide the regulated hydraulic pressure. The motor pump makes a low humming noise during operation; this is normal.
Pumping makes the stopping distance longer. Just press firmly on your brake pedal when you need to slow down or stop.
• The Anti-Lock Brake System (ABS) cannot prevent the natural laws of physics from acting on the vehicle, nor can they increase braking or steering efficiency beyond that afforded by the condition of the vehicle brakes and tires or the traction afforded.
• The ABS cannot prevent collisions, including those resulting from excessive speed in turns, following another vehicle too closely, or hydroplaning.
• The capabilities of an ABS-equipped vehicle must never be exploited in a reckless or dangerous manner which could jeopardize the user’s safety or the safety of others.
This is normal, indicating that the Anti-Lock Brake System is functioning.
Test yourself
A quick Jeep Wrangler quiz: every answer comes with an explanation and a link to the manual page.