Problem was 2 years ago, but here's an answer for anyone with similar probs. Replace your brake switch (near the top of your brake pedal arm. This switch controls not only the brake lights but the lock-out function of your shift lever (automatic trans.) If it's not working, both will be non-functional - as well as cruise control. First, check to see if you have rear brake lights when stepping on brake. If you do not, and also don't have shift-from-Park ability it's most likely the brake switch. It's a $10. part on the web, more like $27. from a dealer, and can be installed yourself IF (and it's a BIG "if"!) you can tolerate laying head-down on your back under the brake pedal and looking up into (and working in) a VERY confined and tight space. Claustraphobics will NOT be happy, guaranteed. Otherwise, just disconnect the wiring lead from the back of the switch, turn the switch 1/8 of a turn (see link below) to release, remove it, replace with new switch, turn to lock in place, replace wiring lead - voila! If you're lucky, it's a 2 minute repair. If your arms won't fit in well or you have claustrophobia or a bad light source - well, good luck. Just make sure switch is seated properly after re-install before reattaching lead wire - no wobbles and good tight fit, or you'll have to pull it again and re-seat it. Here's a photo by a helpful person, scroll down for larger version and 1-2-3 instructions...
http://www.bing.com/images/search?q=Brake+Light+Switch+mazda&view=detail&id=E32D09B5EB3F5A8C3A19530156DD414EA5E732A4&first=0&FORM=IDFRIR
Good luck!
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Tuesday, November 15th, 2011 AT 1:00 PM