17NA040

Bulletin No.:
Service Bulletin
Date:
17-NA-040
September, 2021
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
Corvette
2014
2021
SS
2014
2017
Involved Region or Country
North America, Japan, Europe, Russia, Middle East, China, Iraq, Israel, Palestine,
Cadillac Korea (South Korea), Thailand
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
Buick Regal
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.
3326987
Copyright 2021 General Motors LLC. All Rights Reserved.
Page 2
Legend
(1)
September, 2021
Bulletin No.: 17-NA-040
Cadillac Models and Chevrolet Models
Abutment Area
3326987
4064756
Legend
(1)
(2)
(3)
Cleaned Abutment Area
Correct Amount of Copper Paste
Incorrect Amount of Copper Paste
Legend
(1)
Abutment Area
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.
4. Re-install the front disc brake pads. Refer to Front
Disc Brake Pads Replacement in SI.
4064756
Legend
(1)
(2)
(3)
Cleaned Abutment Area
Correct Amount of Copper Paste
Incorrect Amount of Copper Paste
Bulletin No.: 17-NA-040
September, 2021
Page 3
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
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.
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.
4337814
4364263
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.
Page 4
September, 2021
Bulletin No.: 17-NA-040
Parts Information
For Export Regions that may not be able to obtain the
part numbers below, please use an appropriate
equivalent.
Description
Lubricant
Part
Number
19303310
(In Canada,
use
19303311)
Qty
3
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.
Labor
Operation
Description
Labor Time
2480038*
Cleaning and Reapplying
Lubricant to Front Disc
Brake Pads
0.6 hr
Add
Cleaning and Reapplying
Lubricant to Rear Disc
Brake Pads
0.4 hr
*This is a unique Labor Operation for bulletin use only.
Version
7
Modified
March 6, 2017 – Added the Cadillac CT6 model.
March 17, 2017 – Removed an Important statement from Service Procedure.
November 30, 2018 – Added the 2018 and 2019 Model Years.
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.
December 18, 2020 – Added the 2020 CT6 Model and updated the Involved Region or
Country section.
August 27, 2021 – Added the 2020 Model Year to Regal, 2021 Model Year to Corvette
and updated the Involved Region or Country section.
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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