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Service bulletin 04-007-20-3713a

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)
TypeService bulletin
NHTSA id10183590
Published by NHTSA2020-12-03
Manufacturer's number04-007-20-3713a
Manufacturer's date2020-11-09
NHTSA componentPARKING BRAKE:ELECTRICAL; SERVICE BRAKES; EQUIPMENT

NHTSA's summary

Some vehicles equipped with electric parking brake (EPB) may exhibit a grinding noise from the rear brakes when braking. This may be caused by the rear brake pads not having the capability to remove the rust from the rear brake discs. The red rust accumulated on the discs is exposed to high temperatures during braking, and consequently the rust turns black. As the black rust is too hard to be removed by the brake pads, the rust progress is accelerated, resulting in the grinding noise.

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, Equipment and accessories, Parking brake

Vehicles listed
MAZDA CX-32019, 2020
MAZDA CX-52016, 2017, 2018, 2019, 2020
MAZDA CX-92016, 2017, 2018, 2019
MAZDA MAZDA62016, 2017, 2018, 2019, 2020

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

Other bulletins for the same vehicles and component
04002152022-06-06. Service bulletin. Electric parking brake (EPB) warning light on/EPB will not release in cold weather
04-004-21-38212021-10-02. Service bulletin. Some vehicles may exhibit: Vehicle body vibration when moving from a stop while using the Electric Parking Brake (EPB) automatic release function. Uneven rear brake pad wear. These concerns may be caused because the automatic EPB caliper release timing is too late for the movement of the vehicle. NOTE: Frequent usage of the EPB automatic release function may promote uneven rear brake pad wear. To eliminate these concerns, the EPB control module logic has been modified.
SA3372021-02-08. Service bulletin. Electric parking brake (EPB) maintenance mode procedure change.
04-007-20-37132020-11-03. Service bulletin. Some vehicles equipped with electric parking brake (EPB) may exhibit a grinding noise from the rear brakes when braking. This may be caused by the rear brake pads not having the capability to remove the rust from the rear brake discs. The red rust accumulated on the discs is exposed to high temperatures during braking, and consequently the rust turns black. As the black rust is too hard to be removed by the brake pads, the rust progress is accelerated, resulting in the grinding noise. To eliminate this concern, the brake pad material has been changed in order to improve the rust-removing capability.
SA-062-202020-09-03. Service bulletin. Some customers may complain about the following message displayed in the Multi-Information Display: In the following cases, the MRCC with Stop & Go function system is canceled when the vehicle is traveling at 19 mph (30 km/h) or less: • The Forward Sensing Camera (FSC) cannot detect target objects due to one of the following: • The windshield is dirty • The FSC lens is foggy • There is low visibility due to rain, fog or snow • It is at night and there is not enough light • There is direct or reflected sunlight on the FSC • There is problem with the FSC • There is a problem with the AUTOHOLD control function. • There is a problem with the electric parking brake (EPB).
SA-042-182018-10-09. Service bulletin. DO NOT follow the instructions on MGSS for performing the ELECTRIC PARKING BRAKE (EPB) FORCED RELEASE PROCEDURE until these instructions are read, otherwise, damage to the EPB system may occur The instructions on MGSS are incorrect in one step, but will be corrected soon. NOTE: Performing the electric parking brake forced release procedure is necessary if the electric parking brake cannot be released by operating the electric parking brake switch or performing a recovery operation (*) due to a malfunction in the system or a discharged battery.
01-001-18-3419a2018-09-10. Service bulletin. After parking the vehicle at temperatures below the freezing, some customers may experience a lack of power with the check engine light on and DTC P0638:00 and/or P2112:00 stored in memory. - P0638:00: Throttle valve actuator control range/performance problem (one drive cycle DTC) - P2112:00: Throttle valve actuator motor current range/performance problem (one drive cycle DTC) This concern may be caused by condensed water in the intake manifold entering the throttle valve. After parking at temperatures below freezing, the throttle valve may be frozen at the stand-by position, resulting in the symptom. To prevent this concern, the control logic of the PCM has been modified to avoid frozen the throttle valve (by moving the valve at a certain time after the ignition has been turned off). NOTE: With this modification, the main relay may stay on up to 90 minutes after the ignition switch is turned off. "BATTERY INSPECTION" in the Workshop Manual will be modified to properly check the battery parasitic draw after this modification.
040011733032017-09-27. Service bulletin. Some vehicles may exhibit a squeak type noise from the rear brakes when driving at approximately 6-12mph (10-20km/h) with or without light braking. The noise usually occurs when driving immediately after the parking brake is released. The noise may be caused by poor bake pad adhesive tape contact.
04-001-17-3303a2017-08-10. Service bulletin. Some vehicles may exhibit a squeak type noise from the rear brakes when driving at approximately 6-12mph (10-20km/h) with or without light braking. The noise usually occurs when driving immediately after the parking brake is released. The noise may be caused by poor bake pad adhesive tape contact.
SA1302017-02-15. Service bulletin. WHEN PERFORMING SERVICE ON THE ELECTRIC PARKING BRAKE (EPB) SYSTEM, BE AWARE THAT SOME EPB PARTS REQUIRE UNIQUE REMOVAL/REPLACEMENT PROCEDURES. IF THE VEHICLE IS DELIVERED TO THE CUSTOMER WITH INCOMPLETE EPB SERVICE, THE CUSTOMER MAY EXPERIENCE IMPROPER OPERATION OF THE EPB SYSTEM.WHEN THE ELECTRIC PARKING BRAKE IS OPERATED/RELEASED, THE ELECTRIC PARKING BRAKE CONTROL MODULE PERFORMS AUTOMATIC ADJUSTMENT OF THE EPB AND DIAGNOSIS OF EPB SYSTEM.NOTE: IF ANY WARNING LIGHT IS ON AFTER OPERATING THE EPB SWITCH, REFER TO WORKSHOP MANUAL TROUBLESHOOTING.