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I think the ABS light should come on momentarily with the ignition switch. It's running its self test, and if all is OK, the light goes out. If it detected anything wrong, the light will stay on.
I'm not sure if I've ever felt mine activate on a really slippery surface either, so I don't know how to fully test its actual function.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.