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The ABS module is one of the most common reasons a car ends up at the garage with the brake warning light on. It's also one of the most expensive parts to buy new - which is why many drivers look at used modules instead. This guide explains what to check before you order.
What the ABS module actually does
The ABS module (anti-lock braking system) is a small electro-hydraulic unit sitting between the master brake cylinder and the wheel brake lines. It monitors each wheel's speed and, if a wheel is about to lock under hard braking, releases pressure to that wheel several times a second. Modern modules usually also handle traction control (ASR/TCS) and electronic stability control (ESP).
Symptoms of a faulty ABS module
The ABS warning light on the dashboard is the main symptom, but not the only one. A pulsing or unstable brake pedal, traction control cutting out, fault codes pointing to the pump or a specific wheel circuit, or an audible pump motor noise on cold starts all point to the module, not the sensor.
How to tell a module fault from a sensor fault
Many drivers replace the wheel speed sensor hoping to fix the ABS light, when the real cause is the module itself - and vice versa. The exact fault code usually points to a specific circuit or component, but if the fault relates to the internal pump motor or the control electronics, the module is almost always the culprit, not the external sensor.
Buying a used module - three things to check
First, compare the part number carefully - the casting number on the housing isn't enough; you need the full OEM number from the white sticker. Second, make sure the module comes from the same model generation, drivetrain type and brake configuration. Third, check whether the module needs additional coding after fitting - most VAG and BMW modules do, so it's worth clarifying with your garage beforehand.
Why the wrong module version can be dangerous
Unlike many other parts, a wrongly fitted ABS module isn't just an inconvenience - it can disrupt the correct brake pressure distribution between wheels, which directly affects braking safety. That's why accuracy in this category matters more than in almost any other parts category.
How EVROTRANS tests used ABS modules
Every ABS module we ship is tested on a diagnostic bench before it's added to the catalogue. We apply power, check every circuit, run the pump motor under load and read the fault memory. Modules with recorded hardware faults are rejected. The rest are offered with a 14-day return right and a free compatibility check by make, model and year of manufacture.
Give us the make, model and year before you order, and we'll confirm whether the module fits your car - usually within 15 minutes on working days. Available ABS modules are here.
Frequently Asked Questions
- Do all ABS modules need coding after fitting?
- Not all, but most VAG and BMW models do - we clarify this before you order.
- How do I know if it's the module or the sensor that's faulty?
- The exact fault code usually shows it - if you're unsure, get in touch.
- Does a used ABS module fit a different model year?
- Often not - even within the same model, the module version can differ between years.
- Do ABS modules come with a warranty?
- Yes, the 14-day return right applies to every ABS module we offer.