my ABS, Traction control and brake are all lit up on my dashboard. I've noticed that when i'm going above 50mph and hit a bump my front tires shake bad. i have to brake and slow down to stop it. I'm guessing that shaking is due to the spring convertion i had done i also had the truck raised 2 inches when i did the convertion. the truck also pulls either right or left depending on the road at times i feel like i'm going to loose control.

 

what year is the truck? when is the last time the pads/rotors were changed out? for the shaking, check the panhard rod bushings. they are probably worn out.

 

its a 1999 hse

 

Start with a new steering stabilizer, Old Man Emu, then look at your tires and or alignment to correct the wheel shake.
When that is all taken care of then you can tackle the ABS issue.