Bulletin No.:

Service Bulletin

Date:

17-NA-040
November, 2023

TECHNICAL
Subject:

Brake Squeal or Squeak Noise Intermittently on Initial Brake Applies

Brand:

Model:

Buick

Regal GS
ATS
XTS

Cadillac

CTS (VIN A)

Model Year:
to

2013

2020

Engine:

Transmission:

—

All

All

—

All

All

—

All

All

from

to

2013
2014

2019

ATS-V
CTS-V

2016

CT6
Chevrolet

VIN:

from

2020

Camaro

2016

Corvette

2014

SS

2014

2024
2017

Involved Region or Country

North America, Europe, Russia, Middle East, Iraq, Israel, Palestine, Cadillac Korea
(South Korea), Thailand, China, Japan

Condition

Some customers may comment on a squeal or squeak noise from the front brakes. This
condition normally only occurs on initial brake applications after the vehicle has sat for
an extended time. The condition occurs typically under light braking, in speeds under
16 km/h (10 mph). After 1-6 brake applies, or after braking at higher speeds, the noise no
longer occurs. This condition may occur more often in high humidity conditions.

Correction

Apply a coat of copper paste to completely cover the pad backing plate abutments on
each end.

Service Procedure
Important: Service agents must comply with all
International, Federal, State, Provincial, and/or
Local laws applicable to the activities it performs
under this bulletin, including but not limited to
handling, deploying, preparing, classifying,
packaging, marking, labeling, and shipping
dangerous goods. In the event of a conflict between
the procedures set forth in this bulletin and the
laws that apply to your dealership, you must follow
those applicable laws.

Copyright 2023 General Motors LLC. All Rights Reserved.

Important: The use of wheel cleaners or power
washers directly pointed at the brake caliper may wash
the copper paste off of the brake pads. It may be
necessary to apply the copper paste again if the
lubricant is washed away. The copper paste should be
applied whenever the brake pads are removed or
replaced.
Apply a coat of copper paste to completely cover the
pad backing plate abutments on each end. The paste
should not extend onto the friction material. Follow the
instructions listed below.

Page 2

November, 2023

Bulletin No.: 17-NA-040

1. Remove the front disc brake pads. Refer to Front
Disc Brake Pads Replacement in SI.
2. Using acrysol Kent Industries Part# P2005 or
equivalent, wipe clean both ends of the abutment
area on the front pads and calipers.
3. Apply approximately 0.10 g (0.0035 oz) of copper
paste to each end of the disc brake pad abutments
that contact the brake caliper bracket.
Note: Avoid a light apply of the paste as illustrated
above.

Buick Regal

4. Re-install the front disc brake pads. Refer to Front
Disc Brake Pads Replacement in SI.
Cadillac Models and Chevrolet Models
Important: Do not apply copper paste if the vehicle is
equipped with copper free brakes RPO BCD.

3326987

Legend
(1)

Abutment Area

3326987

Legend
(1)

5926095

Legend
(1)
(2)
(3)

Cleaned Abutment Area
Correct Amount of Copper Paste
Incorrect Amount of Copper Paste

Abutment Area

Bulletin No.: 17-NA-040

November, 2023

5926095

Legend
(1)
(2)
(3)

Page 3

4364263

Cleaned Abutment Area
Correct Amount of Copper Paste
Incorrect Amount of Copper Paste

1. Remove the front disc brake pads. Refer to Front
Disc Brake Pads Replacement in SI.
2. Remove the rear disc brake pads. Refer to Rear
Disc Brake Pads Replacement in SI.

4364283

5. (Chevrolet SS Models Only) Apply a rectangular
shape of copper paste in the center of the spacer
before installing on the back of the pad.
Note: DO NOT replace brake pads for this condition.
6. Re-install the front disc brake pads. Refer to Front
Disc Brake Pads Replacement in SI.
4337633

3. Using acrysol Kent Industries Part# P2005 or
equivalent, wipe clean both ends of the abutment
area on the front and rear pads and calipers.
4. Apply approximately 0.10 g (0.0035 oz) of copper
paste to each end of the disc brake pad abutments
that contact the brake caliper bracket.
Note: Ensure that the ends of the brake pads have
enough copper paste applied, if not, could result of the
noise condition returning.

Page 4

November, 2023

Bulletin No.: 17-NA-040
Description

Part
Number

Molykote Lubricant Antiseize Paste*

19303310
(in Canada,
19303311)

Qty

N/A

*We believe this source and their products to be reliable.
There may be additional manufacturers of such products/
materials. General Motors does not endorse, indicate any
preference for, or assume any responsibility for the products
or material from this firm or for any such items that may be
available from other sources.

Warranty Information
For vehicles repaired under the Bumper-to-Bumper
coverage (Canada Base Warranty coverage), use the
following labor operation. Reference the Applicable
Warranties section of Investigate Vehicle History (IVH)
for coverage information.
4337814

Important: DO NOT remove the silencers (1) on
the pads.
Important: Always replace brake pads with Brembo
GM OEM pads (2). Aftermarket pads could result in the
braking performance changing in many ways.
7. Re-install the rear disc brake pads. Refer to Rear
Disc Brake Pads Replacement in SI.

Labor
Operation

2480038*

Description

Labor Time

Cleaning and Reapplying
Lubricant to Front Disc
Brake Pads

2020-2024
Corvette
RPO J55,
J56, J57
Brakes 1.0 hr
All Other
Models 0.6 hr

Parts Information
Add

Cleaning and Reapplying
Lubricant to Rear Disc
Brake Pads

0.4 hr.

*This is a unique Labor Operation for bulletin use only.

6313566

Bulletin No.: 17-NA-040

November, 2023

Page 5

Version

13

Modified

Revised March 6, 2017 – Added the Cadillac CT6 model.
Revised March 17, 2017 – Removed an Important statement from Service Procedure.
Revised November 30, 2018 – Added the 2018 and 2019 Model Years.
Revised August 11, 2020 – Added the 2020 Corvette Model, updated the Involved Region
or Country section, added an Export region statement to the Parts Information and
relocated the Parts Information and Warranty Information sections.
Revised December 18, 2020 – Added the 2020 CT6 Model and updated the Involved
Region or Country section.
Revised August 27, 2021 – Added the 2020 Model Year to Regal, 2021 Model Year to
Corvette and updated the Involved Region or Country section.
Revised November 17, 2021 – Added the 2022 Model Year to Corvette, updated two
graphics showing copper paste and updated Warranty Information with new Labor Time
for 2020–2022 Corvette with RPO J55 Brakes.
Revised November 9, 2022 – Added the 2023 Model Year to Corvette, Important
statement at beginning of Service Procedure and updated Parts Information to remove
GM part number and add Dupont product information.
Revised April 06, 2023 – Added new picture of product, updated part number and
removed MOLYKOTE® statement under Parts Information.
Revised June 19, 2023 – Added the Chevrolet Camaro and an Important statement at
beginning of service procedure under Cadillac Models and Chevrolet Models.
Revised September 18, 2023 – Added the 2024 Model Year to Camaro and Corvette.
Revised November 09, 2023 – Added additional brake RPOs for Corvette under
Labor Time.

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these
technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper
service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a
job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the
information.

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