A warning ABS light on the dashboard causes many drivers immediate concern, but the anti-lock braking system and brake-related warnings often have an explainable cause. On some Alfa Romeo Junior models, owners report faults due to sensor calibration (adjustment of the sensors). Hydraulic issues and software faults in the control system can also occur. These problems are part of broader Alfa Romeo Junior issues that can usually be resolved well with the right diagnosis. In this article, you can read what an ABS warning actually means and how to deal with it sensibly.
What does an ABS fault warning mean?
The anti-lock braking system, or ABS, prevents the wheels from locking during an emergency stop. Sensors on each wheel continuously measure wheel speed and send that information to the control unit. When a wheel is about to lock, the system automatically reduces brake pressure. This happens up to fifteen times per second. That keeps the car steerable, even when braking hard on a slippery road.
When the ABS light comes on, it means the system has detected a fault. This may be a temporary error, but it can also mean the function has completely failed. In the Alfa Romeo Junior, the ABS is integrated with the electric powertrain and the driver assistance systems. As a result, a fault is sometimes linked to software or sensors in the broader ADAS systems (driver assistance systems).
Can I drive safely with an ABS warning?
Continuing to drive with an ABS warning is generally possible. However, a modified driving style is needed. Without working ABS, the wheels can lock during heavy braking, leaving you with less grip and control.
- Drive calmly and avoid unnecessary emergency stops.
- Keep extra distance from the car in front.
- Have the fault checked by a specialist as soon as possible.
- Pay attention to other messages on the infotainment system, such as warnings about the electric parking brake.
On the electric and hybrid variants of the Junior, owners sometimes report a separate warning for the parking brake. This happens when the car is not fully in P (park position for the automatic gearbox) after switching off the engine. This is due to the quiet operation of the powertrain, which prompts the system to warn more emphatically.
How is an ABS sensor diagnosed?
A fault in the ABS is established by reading the ECU (electronic control unit) with a diagnostic tool. This readout shows which sensor or component is causing the fault warning.
Common causes of ABS faults
- Dirty or damaged ABS sensors (sensor elements of the anti-lock braking system), for example due to mud or debris.
- Calibration problems after servicing or a wheel change.
- Hydraulic problems in the braking system.
- Software faults within the ECU or the driver assistance systems.
If the issue is contamination, cleaning the sensor is often enough. However, a defective sensor must be replaced. Software-related faults require an update through an authorised Alfa Romeo specialist.
What are the repair costs for ABS problems?
The cost of fixing an ABS fault depends heavily on the cause. Cleaning a dirty sensor costs considerably less than replacing a sensor or repairing hydraulic components. Software faults resolved with an update often only involve labour, with no parts needing replacement.
Always have the car diagnosed first before estimating costs, as an ABS light can have multiple causes. A targeted diagnosis via the ECU prevents unnecessary repairs. That way, the correct component can be repaired directly.
‘ Noticeable pulsations in the brake pedal during an emergency stop are normal and, in fact, show that the ABS is active. ’
Watch for signs from your Alfa Romeo Junior
In addition to the ABS light, the Alfa Romeo Junior also gives other brake-related warnings, such as alerts about the electric parking brake via the infotainment system. When leaving the electric Junior, it is important to switch off the engine. Then activate the parking brake. Afterwards, put the car into P (park). This prevents false warnings and ensures the car is parked safely.
Noticeable pulsations in the brake pedal during an emergency stop are normal and, in fact, show that the ABS is active. Unsure about a warning? Then consult the explanation screen in the car’s infotainment system or have the system checked by a specialist.
On the Carnews website you will find many more articles about common car problems, maintenance tips and experiences from other owners. Explore the website for more information about the Alfa Romeo Junior and other models, and stay up to date with the signals your car is giving you.
Frequently asked questions
The most common causes of a lit ABS or brake warning light are a defective or dirty ABS sensor, a fault in the ABS control unit, a low brake fluid level, or wear/overheating of brake components. When the ABS light is on, the normal braking system will usually still work, but without ABS support, and you should continue more cautiously and leave extra distance. If the red brake warning light comes on (or you clearly feel reduced braking performance), you should stop safely as soon as possible and not continue using the car. In all cases, it is wise to have a garage or main dealer read the fault codes in the ECU as soon as possible and resolve the cause.
The anti-lock braking system (ABS) continuously measures the rotational speed of each wheel and rapidly reduces brake pressure on a wheel that is about to lock, then builds the pressure back up so that you can brake as hard as possible and still keep steering. In normal use, ABS improves safety because the car remains stable and controllable under heavy braking, especially on changing or slippery surfaces. The downside is that the stopping distance can sometimes be slightly longer on loose or very uneven road surfaces, and the pedal can vibrate, which some drivers find unpleasant. During very sporty driving (for example on a circuit), a very intrusive ABS system can limit the driver’s ability to ‘threshold brake’ at the limit of grip, so experienced drivers sometimes prefer a milder or switchable system.
In addition to ABS, systems such as EBD (Electronic Brakeforce Distribution), BAS/Brake Assist and ESC/ESP (Electronic Stability Control/Programme) often work together to optimise safety and performance. EBD dynamically distributes braking force between the front and rear wheels, while BAS automatically applies maximum braking pressure in an emergency, even if you do not fully press the pedal yourself. ESC/ESP intervenes if the car is about to lose control by braking individual wheels selectively to maintain stability. Additional systems such as traction control (TCS/ASR) and hill-hold/hill-start assist can also contribute to greater safety and control when braking and pulling away.
Check the brake fluid level regularly and only top up with the specified fluid if the level is too low. Visually inspect your brake discs and pads for excessive wear, rust or grooves, and listen for unusual squealing or grinding noises while driving. Keep the wheel hubs and the area around the ABS sensors clean (no accumulated mud or dirt) so the sensors can continue to measure properly. At every service, have the brakes and ABS system read and tested preventively, especially if a warning light has ever briefly appeared.
It is advisable to seek professional help as soon as the ABS light or a brake warning message comes on while driving, or when you experience unusual vibrations, reduced braking power or other noticeable changes in braking behaviour. Even if warnings recur repeatedly or you are unsure about the safety of the braking system, the car should be read immediately by an authorised specialist via the ECU. Repair costs vary widely: cleaning or replacing a single ABS sensor can be relatively inexpensive, while faults in the ABS module, hydraulic unit or more extensive brake work can be significantly more expensive. Also factor in diagnostic costs for reading the system, which are often charged as a separate item.
