abs and traction control light comes on with a mess of service stability system. on 2002 Cadillac DeVille

lights come on when i push the breaks and pedal shakes but not all the time.

Asked by for the 2002 Cadillac DeVille
sounds like the rotors are warped causing shimmy but scan abs and traction codes and post so we can adv
i just took it to firestone and they said it was fine.
but ill get the codes for it anyways
that was your first mistake, take it to a good mech and have codes scanned. if you feel this shimmy and the lights are on there is a problem. AGREED
1 more answer
Check your wheel bearings. When the bearing gets hot it triggers the sensors in the hub. At least mine did.