Possible faults with the anti lock braking system if the warning light comes on intermittently?

Check the fluid level as that is easy to do but a bad wheel speed sensor will often cause this. It happens intermittently and will turn the light on briefly and then it goes off when the signal returns to normal. Have a shop test it out and see if a code is present and have them check the wiring,air gap of the sensor and inspect the tone wheel for rust. I have seen all of the above cause this on vehicles.