Service Update
17488 Rear Brake Caliper Bolt Loose or Missing
Reference Number:
Attention:

Release Date:
Revision:

N172125780

January 2018
00

This service update includes vehicles in dealer inventory and customer vehicles that return to the
dealership for any reason. This bulletin will expire at the end of the involved vehicle’s New Vehicle Limited
Warranty period.

Make
Cadillac

Model
ATS
CTS

Model Year
From
To
2018
2018

RPO

Description

Involved vehicles are marked “open” on the Investigate Vehicle History screen in GM Global Warranty Management
system. This site should always be checked to confirm vehicle involvement prior to beginning any required inspections
and/or repairs.
Condition

Correction

Certain 2018 model year Cadillac ATS and CTS vehicles may have a condition in which a rear brake
caliper bolt may be loose or missing. A loose brake caliper bolt could cause a rattle noise in the rear of
the vehicle. A missing bolt could cause a rattle or rubbing noise, or allow the brake caliper to rotate
outward and contact the rim.
Inspect the rear brake caliper mounting bolts and related components. Replace any missing caliper
mounting bolt, and torque all rear brake caliper mounting bolts.

Parts
Quantity
As
Required

Part Name
Bolt/Screw – Rear Brake Caliper Guide Pin

Part No.
13579698

Due to the small number of vehicles involved and due to limited initial parts availability, dealers are encouraged not to
order parts for use as shelf stock. Parts should only be ordered when inspection determines that it is necessary to replace
a missing rear brake caliper guide pin bolt.
It is estimated that less than 1% of involved vehicles will require rear brake caliper guide pin bolt replacement. Please
order parts accordingly.
Reminder: Parts may be removed from Retail Inventory Management (RIM). Dealers should review the affected parts
to confirm RIM managed status. Parts may have quantity limiters in effect.
Warranty Information
Labor
Operation
9103588

Description
Inspect Rear Caliper Bolts, Tighten to Specification.
ADD: Replace Each Missing Caliper Mounting Bolt

Labor
Time
0.4
0.1

Trans.
Type
ZFAT

Net
Item
N/A

Service Procedure
1.

Remove the left and right rear wheels. Refer to Tire and Wheel Removal and Installation in SI.

Copyright 2018 General Motors. All Rights Reserved.

Page 1 of 3

Service Update
17488 Rear Brake Caliper Bolt Loose or Missing

4926173

2.

Inspect the left and right rear caliper mounting bolts for proper installation.


If all 4 bolts appear to be installed correctly, proceed to the Caliper Bolt Tightening Procedure below.



If any of the bolts are missing or extremely loose, proceed to the Brake Component Inspection Procedure below.

Caliper Bolt Tightening Procedure

4926174

1.

Using a backup wrench to hold the brake caliper guide pin stationary, tighten the 4 caliper guide pin bolts to 36 N.m
(27 lb ft).

2.

Reinstall the left and right rear wheels. Refer to Tire and Wheel Removal and Installation In SI.

Brake Component Inspection Procedure
1.

If one or more of the caliper mounting bolts are missing or extremely loose, inspect the following components for
damage:


Caliper housing



Caliper mounting bracket



Caliper guide pins and seals



Brake inner and outer pads



Retractor springs



Brake rotor



Road wheel
Page 2 of 3

Service Update
17488 Rear Brake Caliper Bolt Loose or Missing
If a component is damaged or missing, replace the part using the applicable SI procedure and labor time.
2.

Replace the loose/missing mounting bolt.

3.

Using a backup wrench to hold the brake caliper guide pin stationary, tighten the 4 caliper guide pin bolts to 36 N.m
(27 lb ft).

4.

Reinstall the left and right rear wheels. Refer to Tire and Wheel Removal and Installation In SI.

Dealer Responsibility
Whenever a vehicle subject to this service update enters your vehicle inventory, or is in your facility for service in the
future, and the vehicle is still covered under the New Vehicle Limited Warranty, you must take the steps necessary to be
sure the service update correction has been made before selling or releasing the vehicle.
All new, used, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc. in dealers' possession
and subject to this bulletin must be held and inspected/repaired per the service procedure of this bulletin before customers
take possession of these vehicles. Involved vehicles must be held and not delivered to customers, dealer-traded,
released to auction, used for demonstration, or any other purpose.
All GM Certified Used vehicles currently in the dealers’ inventory within the Certified Pre-Owned Inventory System
(CPOIS) will be de-certified and must be held and remedied per the service procedure in this bulletin. Upon submitting
an accepted/paid warranty transaction in the Global Warranty Management (GWM) system, the vehicle can be re-certified
for sale within the CPOIS system, or once again be used in the CTP program.

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 tools, equipment, 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 dealer for information on whether your
vehicle may benefit from the information.

We Support
Voluntary Technician
Certification

Page 3 of 3

GLOBAL SAFETY FIELD INVESTIGATIONS
DCS4646
URGENT - DISTRIBUTE IMMEDIATELY
Date:

January 05, 2018

Subject: 17488 - Service Update
Rear Brake Caliper Bolt Loose or Missing
Models: 2018 Cadillac ATS, CTS
To:

All General Motors Dealers

General Motors is releasing Service Update 17488 today. The total number of
U.S. vehicles involved is approximately 1,221. Please see the attached
bulletin for details.
Global Warranty Management (GWM)
The Investigate Vehicle History (IVH) screen in the GWM system will be updated
January 6, 2018. A list of involved vehicles in dealer new inventory is attached to this
message. Please hold all warranty transactions until IVH has been updated.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS