ABS (Anti-lock Braking System) prevents wheels from locking during braking. It relies on wheel sensors, a hydraulic pump, and an ECU.
Failures occur when any component provides incorrect data or cannot regulate hydraulic pressure.
1. Wheel Speed Sensor Failure (Most Common)
Wheel sensors measure RPM for each wheel.
Facts
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Responsible for 40–60% of ABS faults
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Often caused by dirt, corrosion, or wiring damage
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Triggers ABS, traction control, and stability control lights
2. ABS Module Failure
The ABS module processes sensor data and controls pump pressure.
Causes
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Internal electrical failure
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Corrosion
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Overheating
Common in Ford, Mazda, Toyota, VW vehicles.
3. Hydraulic Pump Failure
The hydraulic pump regulates brake pressure during ABS activation.
Symptoms
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No ABS during emergency braking
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ABS warning light
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Hard pedal feel
4. Low Brake Fluid
Low fluid causes pressure drops.
Facts
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Triggers brake and ABS warnings
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Indicates leaks in brake lines or calipers
Conclusion
ABS failure is primarily caused by wheel sensor faults, hydraulic pump issues, module failures, or low fluid. Proper diagnostics require scanning ABS-specific codes, not just OBD-II.
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