NHTSA ID Number: 10228891
Manufacturer Communication Number: 21-NA-142
TSB/Document Date: 2023-01-06
Summary
This technical bulletin provides repair information to correct a customer concern of hearing front brake grind/groan noise after sitting overnight.
Bulletin No.:
Service Bulletin
Date:
21-NA-142
December, 2022
TECHNICAL
Subject:
Front Brake Grind/Groan Noise After Sitting Overnight
This bulletin replaces PIT5805B. Please discard PIT5805B.
Brand:
Model:
Enclave
XT5
XT6
Model Year:
from
2020
2021
Blazer
2021
Colorado
2021
Traverse
2020
Acadia
Canyon
to
2021
Involved Region or Country
VIN and DATE Breakpoints:
from
All
All
to
5GAERBKW8LJ296460
2023
2022
2023
1GNERKKW5LJ296020
2022
North America, Russia, Middle East, Palestine, Japan, South Korea, Bolivia, Ecuador,
Chile, Colombia, Peru, GM Korea, Uzbekistan.
Additional Options (RPOs)
Condition
Some customers may comment on hearing a brake noise on the first few stops. They may
describe it as a grind/groan sound, and it may feel like ABS is active, but it is not.
Cause
The cause of the condition may be the front disc brake pad material.
Note: A revised pad material is being developed to address this noise concern and
should be available in the first quarter of 2023. If the customer is not satisfied with waiting
for the new pads, follow the Correction below.
Correction
Verify the condition is present and check the pad number stamp on the top edge of
the pad.
If you see GA9130 or GA9140, and this is the first visit,
1. Replace the front disc brake pads with the parts listed below, refer to Front Disc
Brake Pads Replacement in the Service Manual
2. Scuff the rotors.
3. Perform the Brake Pad and Rotor Burnishing procedure. Refer to Brake Pad and
Rotor Burnishing in the Service Manual Complete a minimum of 20 stop events.
If you see GA9140, and this is a second visit,
1. Replace the front disc brake pads with the parts listed below, refer to Front Disc
Brake Pads Replacement in the Service Manual
2. Scuff the rotors.
3. Perform the Brake Pad and Rotor Burnishing procedure. Refer to Brake Pad and
Rotor Burnishing in the Service Manual Complete a minimum of 20 stop events.
Copyright 2022 General Motors
LLC. All Rights Reserved.
Page 2
December, 2022
Bulletin No.: 21-NA-142
Parts Information
Causal
Part
Description
Part
Number
Pad Kit-Frt
Disc Brk
85520396
(Acadia,
Blazer,
Enclave,
Traverse,
XT5
and XT6
X
Pad Kit-Frt
Disc Brk
Qty
1
85139417
(Colorado,
Canyon)
Warranty Information
Repairs made for the specific concern within this
bulletin will be covered for a period of 24 months or
24,000 miles or 40,000 km, whichever occurs first.
Labor Operation
2486258*
Description
Base Labor Time
Front Disc Brake Pads Replacement and Scuff Both Front
Rotors
Canyon/Colorado – 1.1 hr
Enclave – 1.1 hr
Traverse – 1.1 hr
Blazer – 1.1 hr
Acadia – 1.2 hr
XT5 – 1.1 hr
XT6 – 1.6 hr
*This is a unique Labor Operation for Bulletin use only.
Version
8
Modified
Released June 21, 2021
Revised June 30, 2021 – Replaced LTG Labor Operation with Unique Bulletin Labor
Operation
Revised July 13, 2021 – Updated Parts Information with New Replacement Service Part
# 85520396.
Revised January 27, 2022 – Updated Breakpoints
Revised March 09, 2022 – Changed Blazer End Breakpoint from Date to VIN.
Revised April 14, 2022 – Added Note to Cause, Updated Correction, Increased Labor
Time and Replaced Labor Operation Number.
Revised August 23, 2022 – Added 2023 Model Year to All Models Except Colorado and
Canyon.
Revised December 14, 2022 – Updated Note in Cause 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.
WE SUPPORT VOLUNTARY
TECHNICIAN
CERTIFICATION
- Mixes well with conventional fluids
- Low-moisture formula provides excellent vapor lock...
- Ideal for hydraulic and disc brakes
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TSB/Document ID: 21-NA-142
Replacement Service Bulletin Number:
MFR Communication Date: 2022-12-14
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
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