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What causes the abs and brake light to come on speedometer stop working under 30mph?

Wheel Speed Sensor Issue: The most common cause for both problems is faulty wheel speed sensors. These sensors transmit the wheel speed information to the ECU (Engine Control Unit).

Faulty sensors will result in inconsistent speed signals, affecting ABS calculations and triggering the warning lights and the inaccurate speedometer.

Damaged wiring or connectors: The wheel speed sensors can still become intermittent or dysfunctional due to a break in the wires or improper connection somewhere, again interrupting accurate transmission and triggering the problems.