One problem related to brake loud noise has been reported for the 2011 Mazda MAZDA5. The most recently reported issues are listed below.
Every time I took my car in to dealer for service I questioned the unusual early and uneven wear on the tires. They make a loud noise when driving. I had to replace the tires (toyo proxes) at 22,000 miles. The brakes have always shaken and vibrated since around 17,000 miles. This will occur at high speeds on the interstate and at low speeds. The brake pads are fine. Normal wear on all parts of vehicle. Again very unusual early warping of the rotors for no reason. I feel both are manufacturer defects and should have been replaced at no charge to me. Currently I only have 35,200 miles on my 2012 Mazda and I purchased it in July of 2011. I will probably never purchase another Mazda because I even purchased additional warranty coverage and they do not cover anything for you. I see other people on here have had the same complaints but when you go to the dealer to have it serviced they look at you like you have 3 heads. Todays date 10/25/2015.