BULLETIN NOTES
This bulletin supersedes the previously issued bulletin(s) listed below.
Previous TSBs:

Date(s) Issued:

04-001/22

03/24/22

04-003/22

11/28/22

04-003/20

02/20/20

APPLICABLE MODEL(S)/VINS:
2016-2023 CX-9
DESCRIPTION
Front Brake Noise Symptom 1: Some vehicles may exhibit a click noise when first moving forward or reverse from a
stop OR when first applying the brakes while moving forward at slow speeds. This is caused by deteriorated grease
between the brake pads and the shim, the front brake pads move upward/downward along with the brake rotors during
brake application. When the vehicle moves or the brakes are applied the next time, the front brake pads move to the
other side, which causes a click noise.
Front Brake Noise Symptom 2: Some vehicles may exhibit the brakes having an unusual noise or vibration when
applying the brake. This is caused by rust on the brake disc plate’s surface.
Rear Brake Noise Symptom 1: Some vehicles may exhibit grooves in rear brake disc plate(s). This concern is mostly
found on new or low mileage vehicles, when the brakes are new. The grooves may be caused through abrasion from the
accumulation of metal particles from the rear brake disc plates. The metal particles get caught between the brake pads
and disc plates causing groove damage. To eliminate this concern, the disc plate surface honing process has been
changed to reduce metal particle formation.
Rear Brake Noise Symptom 2: Some vehicles equipped with an 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. This is caused by rust on the brake disc plate’s surface.
NOTE: 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.
Customers having this concern should have their vehicle repaired using the following repair procedure.
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REPAIR PROCEDURE
Front Brake Repair Procedure:
1. Verify the customer concern.
2. Check the disc surface to see if the cause of noise and vibration is the disc’s rust (Some areas of the surface have
fallen off due to rust and are thinned, which may look like black stains on the surface). If rust is the cause of the noise or
vibration when applying the brake, lathe disc's on-vehicle, or replace them with new ones and replace the brake pads.
NOTE:
• Check the disc thickness using a micrometer before lathing, if the thickness is less than 27.6mm, replace the disc
(DO NOT lathe). Measure the thickness in the relatively less rusted area where the pads are hitting but not in the
severely rusted area.
• Disc replacement is acceptable if the repair shop does not have an on-car lathe machine.

3. After lathing the disc, re-measure the disc thickness. Replace the discs if the thickness is below the machining limit of
26.8 mm as well as the brake pads. Refer to the instructions in MGSS:
• FRONT BRAKE (DISC) REMOVAL/INSTALLATION
• DISC PAD (FRONT) REPLACEMENT
4. Verify the repair.
NOTE: Refer to SA-019/20 - (BRAKE NOISE, JUDDER AND DRAGGING DIAGNOSIS AND SERVICING) if brake noise
continues after repair is completed.
Rear Brake Repair Procedure:
1. Verify the customer concern.
2. Replace the rear brake pads with modified ones and the rear disc plates with new ones according to MGSS online.
• REAR BRAKE (DISC) REMOVAL/INSTALLATION
• DISC PAD (REAR) REPLACEMENT
3. Verify the repair.
NOTE: Refer to SA-019/20 - (BRAKE NOISE, JUDDER AND DRAGGING DIAGNOSIS AND SERVICING) if brake noise
continues after repair is completed.

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PARTS INFORMATION
Model Year

Part Number

Description

Qty.

Notes

TAY0-33-28Z

PAD SET, FRT CALIPER

1

--

1

--

L2Y6-33-29Z

ATTACHMENT(SHIMS),PAD-FRONT

TK78-33-251B

PLATE,DISC FRT

0 or 2

--

TAY0-26-48Z

PAD SET, RR CALIPER

1

--

TKY8-26-49ZB

ATTACHMENT (SHIMS),PAD-REAR

1

--

PLATE,DISC RR

0 or 2

--

2016-2023 CX-9

TK78-26-251A

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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 (if vehicle contains OE or Genuine
Mazda brake pads/rotors).
• Additional diagnostic time cannot be claimed for this repair.
Front Brakes
Warranty Type

A

Symptom Code

83

Damage Code

9Y

Part Number Main Cause

7777-SP- W18

Quantity

Operation Number / Labor Hours:

0
Discs and pads/attachments replacement - XXW53XRX /
0.5 Hrs. (For both sides)
Discs lathe, and pads/attachments replacement XXW54XRT / Enter actual time (Max. 1.2 Hrs. for both
sides)
Discs lathe, and discs and pads/attachments replacement
- XXW55XRT / Enter actual time (Max. 1.2 Hrs. for both
sides).
Rear Brakes

Warranty Type

A

Symptom Code

53

Damage Code

9Y

Part Number Main Cause
Quantity

Operation Number / Labor Hours:

7777-SP-S18
0
Pad Set Replacement (Both Sides)
AND
Brake Disc Replacement (Both Sides)
YY833XRX / 0.6 Hrs. (*1)

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