my little yellow light that says ANTILOCK is on now...theres no wierd brake noises or anything, and i dont brake hard much so i dont know if the anti-locking action workin.........its really bright and i dont know how to find whats wrong.....anyone tell me how to find out whats wrong with it????can u "check codes" with the harness under the hood??? or is it a take it to the repair shop kind of thing?