ABS rings for Volvo S40

ABS rings for Volvo S40

An ABS ring, also known as an ABS reluctor ring, is a critical component in your Volvo S40's safety system. This small yet vital part is fitted onto the CV joint and works alongside the ABS sensor to monitor wheel speed. For owners of a Volvo S40, it is not uncommon for these rings to suffer from corrosion and mechanical stress over time, which can lead to cracking. Here at CVJoint24, you will find a carefully selected range of 30 different ABS ring variants, ensuring we have the right part whether you drive an early 1.6-litre petrol model or a later turbo diesel.

Choosing the correct component is essential for your car's anti-lock brakes to function properly and to avoid unwanted fault codes on the instrument panel. Our products are manufactured to withstand harsh European roads, where road salt and moisture frequently accelerate rust on chassis components. By replacing a defective ring promptly, you can prevent more costly repairs to the entire CV joint or ABS control unit.

What does an ABS ring do on a Volvo S40?

On your Volvo S40, the ABS ring acts as a toothed ring that rotates at the same speed as the wheel. As the wheel turns, the teeth on the ring pass a magnetic sensor, generating an electrical pulse. The car's engine control unit (ECU) monitors these pulses to determine if a wheel is about to lock up under braking. If the system detects that one wheel is turning more slowly than the others, it modulates brake pressure to prevent skidding and maintain steering control. Without an intact ABS ring, the system loses its reference signal, disabling key safety features.

It is a sophisticated part of the drivetrain and braking system requiring high manufacturing precision to ensure steady, accurate signals over time. Every single tooth on the ring must be intact, and the spacing between them must be exact. If the ring is damaged or clogged with road grime and corrosion, the sensor signal becomes distorted, immediately affecting how the car's anti-skid and anti-lock systems respond in an emergency.

Common signs of wear

The most common sign that an ABS ring on your Volvo S40 has failed is the ABS warning light illuminating on the dashboard. The fault is often intermittent at first, with the light flickering on and off depending on moisture levels or road speed. Another classic symptom is the ABS kicking in unnecessarily, causing the brake pedal to pulsate or chatter during gentle braking at low speeds, just before coming to a complete stop. This usually occurs because rust has built up underneath the ring and cracked it, altering the gap between the teeth at the break.

The sensor misinterprets this altered tooth spacing as the wheel locking or changing speed suddenly, triggering the ABS when it is not needed. If you notice these symptoms, it is time for a visual inspection to check if the rings are cracked or missing teeth. A cracked ring can also come loose on the CV joint and fail to rotate in sync with the wheel, causing further confusion for the ECU. Ignoring these warnings can compromise braking performance and lead to an MOT failure.

Choosing the right ABS ring

Finding the correct ABS ring for your Volvo S40 requires checking a few technical specifications. Variations exist depending on the engine variant, gearbox and model year. The most critical details are the tooth count on the ring and its inner diameter. An incorrect ring with the wrong number of teeth will send inaccurate speed readings, stopping the ABS from functioning correctly. To make the process as straightforward as possible, we recommend selecting your car's make, model and engine in our vehicle selector. This filters for parts that are technically compatible with your specific car.

If you are still unsure, you can compare the measurements of your old ring with the specifications given in our product descriptions. Remember that a correctly fitted ring requires an interference press fit and must be installed completely free of dirt and corrosion. It is often necessary to clean the seating surface on the CV joint thoroughly with a wire brush before gently heating the new ring and pressing it into place. This prevents the new ring from cracking prematurely due to underlying rust.

Related components to inspect

Feel free to check these related pages for the same vehicle when working on an ABS ring:

When a driveline component shows signs of wear, neighbouring parts on the same car often warrant inspection too. By comparing these exact pages for the Volvo S40, it is easier to determine whether the issue lies solely with the ABS ring or another related drivetrain component.

This is especially important on models where vibrations, play and unwanted noises can transfer symptoms across several parts in the same drivetrain. A quick check of related categories reduces the risk of replacing the right type of part while missing an adjacent component that causes the same underlying fault.

• Volvo S40
• Drive shafts for Volvo S40
• Outer CV joints for Volvo S40
• Propeller shafts for Volvo S40

Why shop with CVJoint24?

CVJoint24 is your dedicated partner when it comes to drivetrain spare parts. As the international shop of a Swedish driveline specialist, we offer technical expertise and a depth of stock that general retailers struggle to match. We focus specifically on parts like drive shafts, constant velocity joints, CV boots and ABS rings, allowing us to guarantee high quality and an exact fit. Shopping with us gives you access to a catalogue where choosing your car's make, model and engine makes ordering the right part for your Volvo S40 simple and reliable.

We understand the technical demands of modern vehicle systems and always strive to supply car parts that meet or exceed original equipment standards. With fast shipping across the EU from our Swedish warehouse and a customer support team that genuinely understands drivetrains, we will have your car safely back on the road in no time. Our specialist focus means we regularly stock components that other suppliers do not carry, making us the natural choice for DIY mechanics and professional garages alike.