Technical
Service Bulletin

Mazda North American Operations
Irvine, CA 92618-2922

Subject:
NOISE FROM REAR BRAKES DUE TO BRAKE DRAGGING

Bulletin No.: 04-001/18

Last Issued: 01/29/2018

BULLETIN NOTES
This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted in Red text.

Previous TSBs: Date(s) Issued:
04-005/17

07/21/2017

04-005/16

08/05/2016

APPLICABLE MODEL(S)/VINS
2016 CX-5 vehicles with VINs lower than JM3KE******866136 (produced before September 9, 2016)
2016 CX-9 vehicles with VINs lower than JM3TC******120519 (produced before September 15, 2016)

DESCRIPTION
Some vehicles with the electric parking brake (EPB) may exhibit rear brake dragging, resulting in brake
noise and abnormal outer brake pad wear.The vehicle may also roll momentarily when starting from a
stand-still with the EPB applied. This concern may be caused by the EPB not releasing completely.
Modifications to the calipers have been made to eliminate this concern.
Customers having this concern should have their vehicle repaired using the following repair procedure.

REPAIR PROCEDURE
1. Verify the customer concern.
NOTE: Make sure the drivers door is closed and driver's seat belt is fastened, otherwise, the EPB
automatic release function will not work.
NOTE: Make sure the vehicle is parked on a level surface.
2. Check that the EPB is automatically releasing both rear wheels at the same time (follow a-d).
a. Depress the brake pedal firmly.
b. Start the engine.
c. Turn the EPB ON with the switch.
d. While holding the steering wheel lightly, start the vehicle slowly from a stop and see if the vehicle rolls to
one side.

Page 1 of 8
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.

© 2018 Mazda North American Operations, U.S.A.

Bulletin No.: 04-001/18

Last Issued: 01/29/2018

- If the vehicle rolls momentarily to one side, the rear caliper of that side is defective. Go to Step 7.
- If the vehicle does not roll, the EPB automatically released correctly. Go to next step.
NOTE: In the example below, vehicle (B) rolls straight; both rear wheels release at the same time. Vehicle
(A) does not release both rear wheels at the same time and the vehicle rolls to one side (A). The EPB
released late / incorrectly

3. Drive the vehicle at low speeds and check if rear brake dragging noise is heard.
- If YES, the caliper on that side is defective. Go to Step 7.
- If NO, go to next step.
NOTE: If it is difficult to detect which side the noise is coming from, lift the vehicle on a hoist and turn the
wheels to verify.
4. With the EPB OFF, verify that the rear disc plates rotate smoothly by hand.
a. Lift the vehicle on a hoist and remove the rear wheels.
b. Depress the brake pedal firmly and turn the EPB ON with the switch.
c. Depress the brake pedal and turn the EPB OFF.
d. Verify that that rear disc plates can be easily rotated by hand (as shown below).
- If the rear disc plate does not rotate (or is difficult to rotate) by hand, that side caliper is defective. Go to
Step 7.
- If the both disc plates rotate smoothly, go to the next step.

Page 2 of 8
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.

© 2018 Mazda North American Operations, U.S.A.

Bulletin No.: 04-001/18

Last Issued: 01/29/2018

5. Inspect the disc plates for bluish black discoloration (A) or whitened damage (B) due to brake dragging.
- If one or more of conditions specified below is found, it indicates a brake dragging concern and the
affected side caliper is defective. Go to Step 7.
- If the disc plates are in normal condition, the problem does not exist. This Service Information is not
applicable.
DISC PLATE INSPECTION

6.Inspect the brake pads for whitened by heat (A) or abnormal wear on only the outer pad (B) due to brake
dragging.
- If one or more of conditions specified is found, it indicates a brake dragging concern and the affected side
caliper is defective. Go to Step 7.
- If the brake pads are in normal condition, the problem does not exist. This Service Information is not
applicable.

Page 3 of 8
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.

© 2018 Mazda North American Operations, U.S.A.

Bulletin No.: 04-001/18

Last Issued: 01/29/2018

BRAKE PAD INSPECTION

7. If the caliper(s) has been found to be defective by the diagnosis procedure, replace the affected side
caliper(s) with a modified one(s) according to the instructions on MGSS online:
CX-5: (REAR BRAKE (DISC) REMOVAL/INSTALLATION) and (ELECTRIC PARKING BRAKE MOTOR
GEAR UNIT REMOVAL/INSTALLATION).
CX-9: (REAR BRAKE (DISC) REMOVAL/INSTALLATION) and (ELECTRIC PARKING BRAKE MOTOR
GEAR UNIT REMOVAL/INSTALLATION).
NOTE: If the disc plate(s) / brake pads are damaged, inspect and replace the affected side(s) as necessary
according to the instructions on MGSS online:
CX-5: (REAR BRAKE (DISC) REMOVAL/INSTALLATION) and (DISC PAD (REAR) REPLACEMENT).
CX-9: (REAR BRAKE (DISC) REMOVAL/INSTALLATION) and (DISC PAD (REAR) REPLACEMENT).
8. Verify the repair.

PARTS INFORMATION
CX-5:

Page 4 of 8
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.

© 2018 Mazda North American Operations, U.S.A.

Bulletin No.: 04-001/18

Last Issued: 01/29/2018

Parts Number

Description

Qty.

Notes

KAY0-26-61XA

Caliper (R)

1

---

KAY0-26-71XA

Caliper (L)

1

---

9956-21-000

Gasket

2 or 4

Replace

1

Replace (1 seal kit contains 2 seals)

0 or 1

Replace if necessary

KAY0-26-44Z Seal Kit, Motor
KAY0-26-48Z

Pad Sub Set

K011-26-251B

Plate, Disc

0, 1 or 2 Replace affected side(s) if damaged

CX-9:

Parts Number

Description

Qty.

Notes

TKY8-26-61XA

Caliper (R)

1

---

TKY8-26-71XA

Caliper (L)

1

---

9956-21-000

Gasket

2 or 4

Replace

1

Replace (1 seal kit contains 2 seals)

0 or 1

Replace if necessary

KAY0-26-44Z Seal Kit, Motor
TKY8-26-48Z

Pad Sub Set

TK78-26-251A

Plate, Disc

0, 1 or 2 Replace affected side(s) if damaged

NOTE: Part numbers of caliper have not been changed by this modification. Distinguish the modified one
from old one using the 3-digit lot number (Production Date) stamped on the caliper (A).
Calipers with the lot number (production date) of 697 (2016/09/07) and higher are modified.

Page 5 of 8
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.

© 2018 Mazda North American Operations, U.S.A.

Bulletin No.: 04-001/18

Last Issued: 01/29/2018

Example: Lot Number 697 = 2016/09/07





Date: 7=7
Month: 9=September
Year: 6=2016

PARTS LOCATION (CX-5 shown below):
Caliper (A), Disc Plate (B), Pad Sub Set (C), Gasket (D)

Bolt (A) (seal kit contains 4 bolts), Gasket (B) (seal kit contains 2 gaskets), Electric Parking Brake
Motor (C)

Page 6 of 8
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.

© 2018 Mazda North American Operations, U.S.A.

Bulletin No.: 04-001/18

Last Issued: 01/29/2018

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 term.
• Additional diagnostic time cannot be claimed for this repair.

Warranty Type

A

Symptom Code

40

Damage Code

9W
**** 26-71X* or **** 26-61X*
(Caliper)

Part Number Main Cause
Quantity

1

Related Part Number

9956-21-000 (Gasket)

Quantity

2 or 4

Related Part Number

KAY0-26-44Z (Seal Kit, Motor)

Quantity

1

Operation Number / Labor Hours:

See the SRT Table below

NOTE: Enter 5555-BK-001 (Qty. = 1) for adding brake fluid.
SRT TABLE:

Page 7 of 8
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.

© 2018 Mazda North American Operations, U.S.A.

Bulletin No.: 04-001/18

Last Issued: 01/29/2018

Operation (Replaced Parts)

Labor Hours

CALIPER

DISC PLATE

PAD

OPERATION NUMBER CX-5 / CX9

Replace one side

Not replaced

Not replaced

XXN1RARX

0.8 Hr.

Replace both sides

Not replaced

Not replaced

XXN1RBRX

1.0 Hr.

Replace one side

Replace one side

Replaced

XXN1RCRX

0.9 Hr.

Replace both sides

Replace one side

Replaced

XXN1RDRX

1.1 Hr.

Replace both sides

Replace both sides

Replaced

XXN1RERX

1.2 Hr.

Page 8 of 8
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.

© 2018 Mazda North American Operations, U.S.A.