Rear rattle when driving over bumps, it stops if I'm applying the brakes - HELP! on 2006 Mazda Mazda5

I have a 2006 Mazda 5. Over the last year I've noticed some rattle sounds coming from under the car. The mechanic looked at it and said that there were a lot of rocks he took out of the undercarriage (a few times a year we drive down logging roads to visit family). Anyway, that clearly was not the problem. It started as an occassional rattle when going over bumps but it has progressed to the point that simply driving anywhere causes it to rattle (rear driver side). The funny thing is....I've noticed that if I'm applying the brake, the rattling stops. Is this a brake issue (or related brake parts) or does it sound like a sway bar/bushings or a loose stabilizer bar link (sway bar end link) that other owners have commented on? The mechanic my husband goes to doesn't seem to know what's going on. I would like to get some insight from someone so I can at least point them in the right direction. It's completely annoying to drive around in a car that looks great, but sounds like it's going to fall apart at any moment. If this situation is brake related and potentially harmful to me or my family, I would like to get it fixed ASAP. Thank you for reading!

by in Blaine, WA on May 07, 2013
4 answers 4 comments
ANSWER by on May 08, 2013
Have ALL brake caliper mounting bolts and hardware checked, also disc pads and their hardware, removed and inspected if necessary. Step on brake, all this stuff tightens up, let off brake gets loose again if missing or defective parts. This is the most likely scenario, others possible. Good mechanic should be able to find this! Other sources of rattle can be found by tapping suspected componets with a rubber hammer.
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COMMENT by on May 13, 2013
Thank you very much for your reply. I've written it down and will take it in to a NEW mechanic. I appreciate you taking the time to get back to me. I really hope it's a brake issue (or at least something that's easy to spot and repair)
COMMENT by on May 14, 2013
Glad to help.
ANSWER by on May 08, 2013
could be several issues. have a 2nd insp done by another mech
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COMMENT by on May 13, 2013
Absolutely! I'm done with the guy hubby likes. I feel like things are done with half effort or not done correctly. Very annoying!
ANSWER by on May 08, 2013
Sounds like a loose brake pad or brake pad retainer.
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COMMENT by on May 13, 2013
I will check into this as well. I've written down all the suggestions here and will take it to a new mechanic. Thanks everyone!
ANSWER by on August 30, 2013
just read your posting and I hope your problem has been fixed by now. We had a similar problem with rattling from the rear of our 2006 Mazda 5 when going over bumps. Our mechanic replaced rear swaybar bushings and haven't heard a sound since.