Skip to content

Inside Mazda


Front Brake Caliper Bolts May Loosen and Fall Off

Mazda North American Operations

June 22, 2020

WASHINGTON, DC. (June 22, 2020) – Mazda North American Operations (MNAO) has filed a defect notification with the National Highway Traffic Safety Administration (NHTSA) for a safety defect, which exists in certain 2020 Model Year Mazda3 and CX-30 vehicles. Mazda’s recall number is 4420F. Due to a manufacturing assembly process error, certain brake caliper mounting bolts may not have been tightened properly.

Loose or missing brake caliper bolts may cause reduced braking performance and/or caliper interference with wheel rotation, resulting in loss of vehicle control and increasing the risk of a crash. Drivers may hear abnormal grinding or rattling noises due to the brake caliper contacting the wheel and possibly other vehicle components.

Vehicle owners do have the option of visiting the dealer for inspection and remedy prior to receiving an owner recall notification letter.

Approximately 7,804 Mazda3 units and 16,233 CX-30 units are affected in the U.S. and U.S. territories.

No accidents or injuries have been reported from the field to date as a result of this defect.

Mazda North American Operations is headquartered in Irvine, California, and oversees the sales, marketing, parts and customer service support of Mazda vehicles in the United States and Mexico through approximately 620 dealers. For more information on Mazda vehicles, including photography and B-roll, please visit the online Mazda media center at

Follow MNAO’s social media channels through Twitter and Instagram at @MazdaUSA and Facebook at


Tamara Mlynarczyk, Mazda North American Operations, 202-467-5092
Emily Taylor, Mazda North American Operations, 949-727-6182