Service bulletin 04-002-23c

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
Type	Service bulletin
NHTSA id	10243546
Published by NHTSA	2023-10-05
Manufacturer's number	04-002-23c
Manufacturer's date	2023-09-15
NHTSA component	SERVICE BRAKES

NHTSA's summary

Symptom 1: Some customers may complain about hearing a grinding noise and/or vibration occur when applying the brake. This is due to rust on the rear brake disc plate. Symptom 2: Some vehicles may exhibit a squeal noise from the rear brakes when braking lightly while driving at a slow speed. The squeal noise is caused by the disk pad surface fluctuating.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Brakes

Vehicles listed
MAZDA CX-30	2020, 2021, 2022, 2023, 2024
MAZDA MAZDA3	2019, 2020, 2021, 2022, 2023, 2024
MAZDA MX-30	2022, 2023

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
2023232	2023-04-18. Brakes
23V275000	2023-04-18. SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
2020264	2020-06-12. Brakes
20V346000	2020-06-12. SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC:CALIPER
2019649	2019-12-19. Brakes

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
MSP61 Warr b	2026-07-03. Service campaign. Mazda Service Program (MSP61) - 2024 CX-30 and 2024 Mazda3, equipped with 6 speakers Connectivity Master Unit (CMU) software concern When using a Bluetooth® connected smartphone and talking with handsfree function on a vehicle with 6 speakers, the person on the other end of the line may have difficulty hearing the driver’s voice. OUTLINE OF REPAIR: Reprogram the CMU software using a USB memory stick. COVERAGE LIMITATION: Vehicles under 3 year/36,000 mile warranty : All repairs in MSP6 1 will be covered under Mazda's New Vehicle Limited Warranty. Vehicles outside the 3 year/36,000 mile warranty : Please submit to Warranty pre - authorization. The repair will be reviewed on a case by case basis. ALL RETAIL , CPO, USED OR UNSOLD IN-STOCK VEHICLES: When an applicable retailed vehicle is brought into the dealer for any type of repair or scheduled maintenance, review the “Warranty Vehicle Inquiry” page in eMDCS to check the status of MSP6 1. If the status is "OPEN" for MSP6 1, repair the vehicle according to the procedures contained in this service bulletin.
SA-029-26	2026-05-05. Service bulletin. This Service Alert supersedes the previously issued SA listed below: The changes are noted in Red. SA-011/24 02/12/24, 06/06/24, 07/29/24 DESCRIPTION Mazda has developed factory recommended scheduled maintenance services that support all major vehicle systems. Mazda recommends dealers follow the scheduled maintenance tables as cited in the vehicle-specific workshop manual or owner's manual. Services performed outside of Mazda's factory scheduled maintenance are not recommended. These services are unnecessary and create unneeded expenses for your customers. SCHEDULED MAINTENANCE Refer to the applicable Workshop Manual or Owner's Manual for vehicle -specific manufacturer scheduled maintenance. Workshop Manual - Refer to section 00-00 SCHEDULED MAINTENANCE. Owner's Manual - Refer to section 8 Maintenance and Care. b. Note: Please refer to the information below outlining the services not included in Mazda's Factory Scheduled Maintenance: IMPORTANT: Recommending fluid flushes when not necessary can lead to customer confusion and dissatisfaction. Fluid flushing for preventive maintenance purposes is strongly discouraged, unless otherwise specified in a published procedure (Owner’s Manual, Workshop Manual, Technical Service Bulletin, etc.).
04-003-25a	2026-01-03. Service bulletin. Some vehicles may experience premature wear of the front inner brake pads. The pads wear down by about 0.1 in (3 mm) every 6200 miles (10,000 km), and may require replacement at less than 12,400 miles (20,000 km). This is caused by intrusion of dirt and sand into the gap between the pad and the rotor. To eliminate this concern, the shape of the dust cover has been changed, and the brake pad chamfer shape has been revised.
SA-055-25	2025-12-05. Service bulletin. Some vehicles exhibit brake related concerns such as brake noise, brake judder or brake dragging. If you encounter a customer complaint for any one of these symptoms, refer to the following information to understand why symptoms may occur, and to better assist the customer in resolving their specific brake concern. NOTE: Before following this Service Alert repair procedure, ensure published TSBs in MGSS have been completed per model year.
04-003-25	2025-11-04. Service bulletin. Some vehicles may experience premature wear of the front inner brake pads. The pads wear down by about 0.1 in (3 mm) every 6200 miles (10,000 km), and may require replacement at less than 12,400 miles (20,000 km). This is caused by intrusion of dirt and sand into the gap between the pad and the rotor. To eliminate this concern, the shape of the dust cover has been changed.
SA-016-24c	2024-11-04. Service bulletin. Some vehicles exhibit brake related concerns such as brake noise, brake judder or brake dragging. If you encounter a customer complaint for any one of these symptoms, refer to the following information to understand why symptoms may occur, and to better assist the customer in resolving their specific brake concern.
SA-007-24b	2024-10-04. Service bulletin. This information will give you the necessary knowledge to respond to customers concerns of Smart Brake Support (SBS) unintended braking. By educating the customer on the system operation, it should reduce their anxiety or distrust of the vehicle.
04-001-24b	2024-10-04. Service bulletin. Symptom 1: Some customers may complain about hearing a grinding noise and/or vibration occur when applying the brake. This is due to rust on the rear brake disc plate. The brake pad has insufficient disc-rust prevention performance, resulting in the disc plate rusting. To eliminate this concern, the pad material has been improved to prevent rust on the disc surface. Symptom 2: Some vehicles may exhibit a squeal noise from the rear brakes when braking lightly while driving at a slow speed. The squeal noise is caused by the disc pad surface fluctuating. To eliminate this concern, the brake pads have been modified.
SA-016-24b	2024-09-04. Service bulletin. Some vehicles exhibit brake related concerns such as brake noise, brake judder or brake dragging. If you encounter a customer complaint for any one of these symptoms, refer to the following information to understand why symptoms may occur, and to better assist the customer in resolving their specific brake concern.
04-001-24a	2024-09-04. Service bulletin. Symptom 1: Some customers may complain about hearing a grinding noise and/or vibration occur when applying the brake. This is due to rust on the rear brake disc plate. The brake pad has insufficient disc-rust prevention performance, resulting in the disc plate rusting. To eliminate this concern, the pad material has been improved to prevent rust on the disc surface. Symptom 2: Some vehicles may exhibit a squeal noise from the rear brakes when braking lightly while driving at a slow speed. The squeal noise is caused by the disc pad surface fluctuating.