ABS warning light: what it means for your brakes
The amber ABS lamp means the anti-lock braking system has disabled itself. Normal braking still works, but the wheels can lock under hard or emergency braking.
Investigate soon — a system is degraded
Not an emergency on its own, but get it diagnosed promptly. If the red brake light is on at the same time, treat it as urgent.
Yes, with extra care. Leave more stopping distance and avoid harsh braking, especially in the wet — you no longer have anti-lock intervention or, on most cars, stability control.
Common causes
- Dirty, damaged or disconnected wheel-speed sensor, or a damaged reluctor ring
- Low brake fluid level detected by the system
- Failed ABS pump motor or control module
- Blown ABS fuse or corroded wiring, often at a wheel-arch connector
- Recently fitted wheel bearing or driveshaft disturbing the sensor
What to do next
- 1Check whether the traction or stability control light came on at the same time — they share sensors.
- 2Check the brake fluid level against the min and max marks on the reservoir.
- 3Note whether the light appears from startup or only after a certain speed; that helps isolate a sensor.
- 4Have the ABS codes read — they usually name the specific wheel circuit at fault.
- 5Keep braking distances generous until it is fixed.
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Ask the AI mechanicFrequently asked
- Do my brakes still work with the ABS light on?
- Yes. The hydraulic braking circuit is separate and continues to function. You lose the anti-lock function that prevents wheel lock-up under heavy braking.
- Will an ABS fault fail a roadworthy or MOT test?
- In most markets an illuminated ABS warning lamp is a test failure, because the safety system is not operating as designed.
General guidance only. Symbols and thresholds vary between manufacturers — always confirm against your vehicle's owner manual, and treat any red lamp as a reason to stop.
Other dashboard lights
- Check engineThe check engine light (an engine-block outline, usually amber) means the engine management system has stored a fault code. Steady means investigate soon; flashing means stop driving.
- Oil pressureThe red oil-can symbol means the engine has lost oil pressure. This is the most serious light on the dashboard — continued driving can destroy the engine in under a minute.
- Brake systemThe red brake light (an exclamation mark inside a circle) covers three very different things: the parking brake being applied, low brake fluid, or a hydraulic circuit fault.
- Battery / chargingThe red battery symbol means the charging system is no longer supplying enough voltage. The car is running on stored battery charge and will eventually stop.
- Coolant temperatureA red thermometer symbol means the engine is overheating. Continued driving risks a warped head, failed head gasket or a seized engine.
- Tyre pressure (TPMS)The amber horseshoe with an exclamation mark means at least one tyre is significantly below its target pressure — or the monitoring system itself has a fault.
- Airbag / SRSThe SRS or airbag symbol means the supplementary restraint system has detected a fault and has disabled itself. In a crash, the airbags or pretensioners may not fire.
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