[wiswind]

I would recommend you double check the brake fluid level in the master cylinder.
If it is even slightly low.....not all the way up to the FULL line, you could get these lights (both of them) due to the low fluid level sensor.
This is the most simple thing that it could be.....and a very common cause of this problem.....the fluid moves around in there while you are driving.......

After that.......I would have a shop read the code(s) to see if the ABS light might be caused by a wheel sensor.
If this is the case.....the code will tell you which wheel sensor is giving the indication.
It might be a simple need to clean brake dust or slightly adjust the distance of the sensor from the exciter ring.
The exciter ring looks like a big gear on the axle........and the teeth of the gear create a pulse when they pass the sensor.
It is common for the rear ones (but can happen to the front as well) to be bumped slightly out of place and be too far from the exciter ring to pick sense the teeth passing.