Mazda MAZDA3 owners have reported 2 problems related to brake disc (under the service brakes category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Mazda MAZDA3 based on all problems reported for the MAZDA3.
Front rotors excessive wear and ridging at 300 miles. Rear rotors excessive wear and ridging, deep groove/pit in right rear at 300 miles.
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all problems of the 2004 Mazda MAZDA3
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After 200 miles I noticed an excessive amount of brake dust accumulating on the rear wheels. The rear brake rotor surfaces are worn extremely uneven with multiple grooves. This type and amount of wear is what I would expect after 10,000 miles not 200. The front brake rotors are hardly worn at all and still exhibit the original machined surface. I found that Mazda has a new brake pad for the rear brakes (p/n: bpyk-26-48z) but no technical service bulletin has been issued.