2000 warning lights!!!!

i recently had my front brakes changed, in the last week though my service engine light came on along with the no trac and low trac light at the same time. does this have to do with the brake change? my battery light also comes on alot the battery is a year old and has been tested and is fine acording to the mechanics. if any one has a clue about this please let me know!!!! thanks
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I hsd the same problem after changing brakes and found that the wiring connectors at the wheel were not tight. I solved it by jiggling the connector around. Hope it works for you.