Preliminary Checks

Ensure all wheels and tires are of approved size (all 4 identical) and tires are properly inflated.
Conventional brake system in proper working order and stoplight switch is operational.
Brake fluid must be at proper level and no hydraulic lines leaking.
Check wheel bearing play and condition. Correct as necessary.
Check wheel speed sensor mounting and build-up of dirt etc.
Check condition of all fuses.
Battery voltage must be at least 10.5 volts.
Ensure ABS control module harness connector is securely connected and is not corroded or damaged.