anti lock brakes, speed control on W22 workhorse

With the brake lights not working I would be looking at the brake light switch. Because the cruise control is also depending on the Brake lights to turn the cruise off, both problems are probably related. The ABS light can just be a dirty wheel sensor. They are not that hard to remove and clean with some "Brake clean"

Here is a link to Omey's web site that shows how to clean the
ABS sensors. When it comes up find "tech Tips" on the left and then click on #8, ABS sensrs.
Oemy's Tech tips