The Mazda3 brake caliper bolt size is m10 X30 mm long flange bolt with a 14 mm hex head. Brake parts will become old and will need to be replaced someday. The brake fluid needs to be changed every 20,000 to 45,000 miles. The brake pads and shoes need replacing every 50,000 miles. The brake rotors need to be changed every 60,000 miles. Your brakes need to be in top condition. Having faulty brakes will lead into problems. For one, the brakes can lock up, which will result in crashes. A loose bearing can make for poor stops. Screeching sounds can arise from not enough brake fluid. Bad brake pads will result in problems with stopping. Premature brake wear is an issue that needs to be looked into.
Lorrie G.
April 10, 2020
The 2020 mazda3 uses a m10 x 1.25 30Mm long flange bolt with 14mm hex head for the caliper bracket bolts
bob andrew
November 5, 2022
NO NO ((The 2020 mazda3 uses a m10 x 1.25 30Mm long flange bolt with 14mm hex head for the caliper bracket bolts)) just went to the dealer to buy one: M10 x 1.5 30mm
Sharing my 2 cents, 2014 Mazda 3i GT has a very hard to find M14-1.25 (30mm long threaded length) flange bolt for the front caliper bracket
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