24-NA-031

Bulletin No.:
Service Bulletin
Date:
24-NA-031
February, 2024
INFORMATION
Subject:
Brand:
Cadillac
Chevrolet
Information on Brake Pulsation and/or Repeat Brake Pulsation
Model:
CT4-V Blackwing
CT5-V Blackwing
Corvette
Model Year:
from
2022
VIN Breakpoint:
to
from
to
2024
—
—
Engine:
Transmission:
—
—
2020
Involved Region or Country
North America, Europe
Additional Options (RPOs)
Equipped with BRAKE SYSTEM-PWR, FRT & RR DISC, ANTILOCK, FRT & RR WHL,
HEAVY DUTY, CARBON CERAMIC ROTORS (DNU NEXT NEW MAJOR) or BRAKE
SYSTEM-POWER, FRT & RR DISC, ABS, 19", HEAVY DUTY (DNU NEXT NEW
MAJOR) (RPOs J57, J6H)
Condition
Some customers may comment on having brake pulsation and/or repeat brake pulsation.
Cause
6541022
Note: Black wheels are not offered as an OEM option.
The condition may be due to the customer painting their wheels and paint got on the
wheel hub surface (1), as shown in the picture above, and the hub bearing surface,
resulting in having lateral runout to be .001 over spec of .002 which is enough to cause
thickness variation of the rotors.
Correction
Copyright 2024 General Motors LLC. All Rights Reserved.
Clean the surface on both the wheel hub and the hub bearing, and inspect the thickness
variation of the rotors.
Important: If the rotors are out of specification, this would NOT be covered under
warranty and would be a customer-pay.
Page 2
February, 2024
Bulletin No.: 24-NA-031
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.
Refer to Front Brake Rotor Replacement and Rear
Brake Rotor Replacement in SI.
Parts Information
Use the VIN and refer to the GM Electronic Parts
Catalog (EPC) to determine the proper part number to
order.
Version
1
Modified
Released February 09, 2024
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