Technical
Service Bulletin

Mazda North American Operations
Irvine, CA 92618-2922

Subject:
04-003/17 SQUEAKING/GRINDING NOISE FROM REAR BRAKE

Bulletin No.: 04-003/17

Last Issued: 06/14/2017

BULLETIN NOTES
This bulletin supercedes the previously issued bulletin(s) listed below. 2017 Mazda3 has been removed.

Previous TSBs:

Date(s) Issued:

04-003/17

04/05/17

04-001/16

01/14/16

04-003/15

11/06/15 and 09/16/15

APPLICABLE MODEL(S)/VINS
2014-2016 Mazda3 (Japan built) vehicles with VINs lower than JM1******355941 (produced before June 24,
2016)

DESCRIPTION
Some vehicles may experience a squeaking/grinding noise from the rear brake even after the brake pedal is
released. Upon inspection, the caliper mounting support is corroded and one of the disc pad is abnormally
worn out (A). This is caused by vehicle usage in an area using road salt. The surface of the mounting
support may swell from corrosion causing premature disc pad wear and brake noise.

To correct the problem, an improved caliper mounting support has been newly established as a service
part. The anti-corrosion surface treatment has been changed from Zn to Zn-Ni plating.
Customers having this concern should have their vehicle repaired using the following repair procedure.

Page 1 of 3
CONSUMER NOTICE: The information and instructions in this bulletin are intended for use by skilled technicians. Mazda technicians utilize the proper tools/
equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by “do-it-yourselfers.” Customers
should not assume this bulletin applies to their vehicle or that their vehicle will develop the described concern. To determine if the information applies,
customers should contact their nearest authorized Mazda dealership. Mazda North American Operations reserves the right to alter the specifications and
contents of this bulletin without obligation or advance notice. All rights reserved. No part of this bulletin may be reproduced in any form or by any means,
electronic or mechanical---including photocopying and recording and the use of any kind of information storage and retrieval system ---without permission in
writing.

© 2017 Mazda North American Operations, U.S.A.

Bulletin No.: 04-003/17

Last Issued: 06/14/2017

REPAIR PROCEDURE
1. Verify that the caliper mounting support(s) is corroded and the disc pad(s) is abnormally worn out.
2. Replace the caliper mounting supports (both sides) with the modified service parts sets and attachments
with new parts according to the instructions on MS3 online or the Workshop Manual (section 04-11 REAR
BRAKE (DISC) REMOVAL/INSTALLATION).
NOTE: Replace the disc plate(s) additionally if damaged by the completely worn out disc pad.
CAUTION: When installing the modified mounting support (A), tighten the installation bolts (B) with the
upper limit of the tightening torque specified in the Workshop Manual (6.6 Nm, 48 ft-lbf, 6.7 kgfm).

3. Verify repair.

Page 2 of 3
CONSUMER NOTICE: The information and instructions in this bulletin are intended for use by skilled technicians. Mazda technicians utilize the proper tools/
equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by “do-it-yourselfers.” Customers
should not assume this bulletin applies to their vehicle or that their vehicle will develop the described concern. To determine if the information applies,
customers should contact their nearest authorized Mazda dealership. Mazda North American Operations reserves the right to alter the specifications and
contents of this bulletin without obligation or advance notice. All rights reserved. No part of this bulletin may be reproduced in any form or by any means,
electronic or mechanical---including photocopying and recording and the use of any kind of information storage and retrieval system ---without permission in
writing.

© 2017 Mazda North American Operations, U.S.A.

Bulletin No.: 04-003/17

Last Issued: 06/14/2017

PARTS INFORMATION
Part
Description
Qty.
Notes
Number
B4YG-26- Mounting Support Set 2
Newly established service parts set that includes: 1 mounting
28X
support, 2 slide pins and 2 dust boots.
B4Y0-26Rear Brake Pad and
1
Newly established service parts set that includes: pad sub set
43ZB
Attachment Set
(B4Y0-26-48ZB) and pad attachment (B4Y0-26-49ZA).
B4Y0-26Pad Sub Set
1 DO NOT use these separate parts. Use the new part set as B4Y048ZB
26-43ZB.
B4Y0-26Pad Attachment
1
49ZA
B45G-26Disc plate
1 or
Replace if damaged.
251A
2

WARRANTY INFORMATION
NOTE:





This warranty information applies only to verified customer complaints on vehicles eligible for
warranty repair.
This repair will be covered under Mazda’s New Vehicle Limited Warranty.
Additional diagnostic time cannot be claimed for this repair.

Warranty Type
A
Symptom Code
82
Damage Code
9Y
Part Number Main Cause /
B4YG-26-28X / 2
Qty.
Operation Number / Labor XXL5CARX/0.5 Hrs. (Mounting support, pad sub set, pad attachment, RR both
Hours:
sides)
XXL5CBRX/0.6 Hrs. (Mounting support, pad sub set, pad attachment, one or
both disc plates, RR both sides)

Page 3 of 3
CONSUMER NOTICE: The information and instructions in this bulletin are intended for use by skilled technicians. Mazda technicians utilize the proper tools/
equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by “do-it-yourselfers.” Customers
should not assume this bulletin applies to their vehicle or that their vehicle will develop the described concern. To determine if the information applies,
customers should contact their nearest authorized Mazda dealership. Mazda North American Operations reserves the right to alter the specifications and
contents of this bulletin without obligation or advance notice. All rights reserved. No part of this bulletin may be reproduced in any form or by any means,
electronic or mechanical---including photocopying and recording and the use of any kind of information storage and retrieval system ---without permission in
writing.

© 2017 Mazda North American Operations, U.S.A.