All of the braking light system lights go on when I am driving.

Thank you. It is a Land Rover Discovery and from what I am seeing on the internet others have had this issue as well and they say it has to do with the ABS system. We have only had this car 2 years and we just now replace the back brakes. We had a friend who was a mechanic do it at home. I don't know if he checked the brake fluid or not. I will ask him to do so and see if that may help. Others told me the differentials needed to be changed because they were foamy. Not sure if I agree with that either. Thanks for the advice. I will look into it.

differentials should serviced once a year. they have nothing to do with brake system. may want to run the VIN# and check if any recalls on that item.