A Loose rear stabilizer bar link can cause a rattling noise from the rear suspension while driving on rough roads. Our technicians tell us if the rear stabilizer bar and links are not found to be loose, there are updated sway bar bushings available which should correct this problem.Google+
Car Problem Reports
Mazda Mazda5 Rattle From Rear Suspension Due to Loose Stabilizer Bar Links
Mazda Mazda5 Problem
Average Mileage: 57,835 mi (25,000 mi - 91,000 mi)
Visitor, 2007 Mazda Mazda5, 57,000 mi
Had been noticing it for a while, and when I checked my warranty, They were covered up till 60,000. Mileage on car? 60,100. Life sucks. Still needing replaced 20,000 miles later. Hopefully getting 'em done in Jan w/ tax check. Even on smooth roads, the front and rear wheels rattle like we're going over speed bumps.
Visitor, 2010 Mazda Mazda5, 62,000 mi
A moderate to severe rattle at 20-35 mph on a bumpy road. Seems to come from passenger rear suspension
Visitor, 2007 Mazda Mazda5, 30,000 mi
There's a knocking sound like something is loose in the suspension. The sound is especially noticeable going over a bump at low speed. The knocking sound first appeared in the front suspension, and I replaced a front stabilizer bar. The knocking sound has now appeared in front and back, and even seems to have come back in the place where it was first repaired. I have since learned that this is a common problem in the Mazda5.
Visitor, 2008 Mazda Mazda5, 75,000 mi
Rattling in rear on bumpy road
Visitor, 2008 Mazda Mazda5, 45,000 mi
Loud noise when I go over any bumps
Visitor, 2009 Mazda Mazda5, 65,000 mi
Squeking issue resolved short term with spray grease on the bushings until new ones are purchased.
Rattling from rear is either the rear shock dust cover vibrating on bumped or loose sway links.