Concord Smog, Tune and Brakes offers tune ups, brake maintenance and repair, smog checks and light mechanical repair for both foreign and domestic cars and trucks. After your vehicle passes, smog checks are transmitted directly to the California Department of Motor Vehicle. Tune-ups include replacing spark plugs, air filters and checking cylinder head bolts and valvetrain adjustments. Concord Smog, Tune and Brakes also does oil changes.