What causes brake, antilock,&traction light to be on on dash

Could be an ABS problem. Have the computer scanned for fault codes, that will lead you to problem area.

Owner: To correctly answer your question, I would have to access the ABS System control unit with a scanner to read the codes, then follow a diagnostic flow chart, the most likely cause would be a wheel speed sensor & sensor harness issue, other possibilities are: Control Unit failure, HCU failure, Fuse, Relay, or wiring problem, incorrect tire size, or spare tire on the car, in service.

I had to replace the abs control module. ( I think that's what it was called )