1999 Cadillac Deville

Any message like traction active? It could be unwanted abs activation that occurred on your year and model. The fix was running seperate wheel speed harnesses to the ebcm, outside of the vehicle harness, and away from secondary ignition wires. The science behind this was to eliminate potential for any electromagnetic interference. This only applied to the front sensors. I suppose you could disconnect the right and left front sensors and see if the problem can be reproduced. You will get an abs light, and the antilock system will not function during this, but it may lead to a process of elimination. Otherwise, have it checked. A GM or Cadillac dealer will have the service bulletin information on this.

if your mechanic said there is nothing wrong. try switching your tires. put rear in front and front in rear. it could be the steel bands in your tires. if this works . you should replace the bad tire or tires .if band are no good tire can blow out.