Service Bulletin

Mazda North American Operations
Irvine, CA 92618-2922

© 2015 Mazda Motor of America, Inc.

Subject:

Bulletin No:

04-003/15

Last Issued:

09/16/2015

SQUEAKING/GRINDING NOISE FROM REAR BRAKE

2014-16 MAZDA3 - SQUEAKING/GRINDING NOISE FROM REAR BRAKE

APPLICABLE MODEL(S)/VINS
2014-16 Mazda3 vehicles with VINs starting with JM1

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 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.

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.
3. Verify repair.

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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.

Bulletin No: 04-003/15

Last Issued: 09/16/2015

© 2015 Mazda Motor of America, Inc.

PART(S) INFORMATION

Part Number

Description

Qty.

Notes

B4YG-26-28X

Mounting Support Set

2

Newly established service parts set that
includes: 1 mounting support, 2 slide pins
and 2 dust boots.

B4Y0-26-48ZB

Pad Sub Set

1

--

B4Y0-26-49ZA

Pad Attachment

1

--

B45G-26-251A

Disc plate

1 or 2

Replace if damaged.

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 (Noise)

Damage Code

9Y (Corrosion)

Part Number Main Cause / Qty.
Operation Number / Labor Hours:

B4YG-26-28X / 2
XXL5CARX/0.5 Hrs. (Mounting support, pad sub set, pad
attachment, R&R both sides)
XXL5CBRX/0.6 Hrs. (Mounting support, pad sub set, pad
attachment, one or both disc plates, R&R both sides)

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