How to detect an ABS fault? Best practices in the workshop
Every day in the workshop, you encounter ABS warning lights that illuminate unexpectedly.
While some cases are resolved quickly, others can be more complex to diagnose. This is because the ABS system relies on a precise balance between sensors, wiring, the control unit, and the hydraulic block. Even a minor imbalance can cause a fault or inconsistent behavior.
And it's not always visible.
Many ABS faults do not trigger a dashboard warning light but can have very real effects, such as a wheel locking up or, conversely, a wheel that no longer brakes.
These cases are often the most difficult to diagnose without experience or the right tools. Hence the importance of a thorough diagnosis and a good understanding of the recurring weaknesses of ABS blocks depending on the brand.
So, how can you effectively detect an ABS system failure without unnecessarily replacing functional parts?
Here are the key points to check, based on our field experience.
Where to start?
The first step is reading the fault codes. A diagnostic scan is essential. Modern ABS control units can provide valuable information: faulty sensor, abnormal power supply voltage, wheel signal loss, or communication problems with other ECUs.
This initial reading often helps isolate the affected area.
But don’t stop there: it’s common for a fault code to mask a mechanical problem or a simple loose connection.
Repair instead of systematic replacement
Replacing an ABS block can cost several hundred euros for the customer. That’s why electronic repair is becoming an increasingly relevant solution. At Reparlab by Faurecia Clarion, we offer to repair these modules in compliance with original standards, with functional bench tests before return.
Our services not only help reduce costs but also limit electronic waste, promoting sustainable repair practices.
Best Practices in the workshop
Bear in mind that an illuminated ABS warning light is not always synonymous with a defective component.
A road test, thorough inspection of connections, and careful interpretation of data can often prevent unnecessary replacements.
Have questions? Find your answers here!
What are the signs of an ABS system failure?
Common symptoms include:
- ABS warning light illuminated on the dashboard.
- Unusual pulsations in the brake pedal.
- Increased braking distances on slippery surfaces.
- Vehicle instability during braking.
- Clicking or grinding noises during braking.
These signs may indicate a malfunction of the wheel speed sensors, the ABS control module, or the hydraulic block.
What are the best practices for diagnosing an ABS system fault?
- Use a diagnostic tool to read specific ABS system error codes.
- Visually inspect the wheel speed sensors for damage or dirt.
- Check the wiring and connectors for signs of corrosion or breakage.
- Test the ABS control module and hydraulic block for electrical or mechanical anomalies.
Accurate diagnosis requires specialized tools and expertise in braking systems. You can submit your repair request now from your professional space.