ABS light + Brake light came on after brake replacement on 2005 Toyota Camry

After having my front brake replace, ABS light and Brake light kept coming on and off not early in the morning, but toward afternoon when the enging is warmng up. Yesterday the check engine light came up as well. I brought my car for diagnostic, I was told the car has speed sensor problem. Please tell me what cause the speed sensor problem? Why did the brake light and ABS light kept showing on and off? Thank you very much!

Asked by for the 2005 Toyota Camry
The shop that did your brakes damaged your ABS speed sensor. Take it to them and they should fix it for no charge! This happens from time to time.
Good Luck!